Kelas 8 Latihan Uub (1)
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Questions and Answers
- 1.
Bentuk sederhana dari 3x - 2y + 7 - 5x + 6y - 3 adalah ....
- A.
4y - 2x + 10
- B.
4y - 2x - 10
- C.
- 2x + 4y - 4
- D.
- 2x + 4y + 4
Correct Answer
D. - 2x + 4y + 4Explanation
The given expression is a combination of terms with variables x and y. To simplify the expression, we can combine like terms by adding or subtracting their coefficients. In this case, we have -2x and 4y as like terms, so we can combine them to get -2x + 4y. The constant terms 7 and -3 can also be combined to get 4. Therefore, the simplified form of the expression is -2x + 4y + 4.Rate this question:
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- 2.
Pemfaktoran dari y2 - 10y + 25 adalah ....
- A.
(y + 5)(y + 5)
- B.
(y - 5)(y - 5)
- C.
(y - 10)(y - 10)
- D.
(y + 10)(y + 10)
Correct Answer
B. (y - 5)(y - 5)Explanation
The given expression is a perfect square trinomial. The expression can be factored as (y - 5)(y - 5) because when we expand this expression using FOIL method, we get y^2 - 10y + 25, which is the original expression. Therefore, the correct answer is (y - 5)(y - 5).Rate this question:
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- 3.
Pemfaktoran dari a2 - 49 adalah ....
- A.
(a + 9)(a + 9)
- B.
(a - 9)(a + 9)
- C.
(a + 7)(a - 7)
- D.
(a + 7)(a + 7)
Correct Answer
C. (a + 7)(a - 7)Explanation
The given expression is a difference of squares, where a^2 - 49 can be factored as (a + 7)(a - 7).Rate this question:
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- 4.
Hasil penjumlahan dari 5a + 4b - 10 dan -2a + 3b + 5 adalah ....
- A.
-3a + 7b - 5
- B.
-3a + 7b + 5
- C.
3a - 7b + 5
- D.
3a + 7b - 5
Correct Answer
D. 3a + 7b - 5Explanation
The given question asks for the sum of two expressions: 5a + 4b - 10 and -2a + 3b + 5. To find the sum, we combine like terms. The coefficients of the 'a' terms are 5 and -2, so the sum of these terms is 5a - 2a = 3a. The coefficients of the 'b' terms are 4 and 3, so the sum of these terms is 4b + 3b = 7b. Finally, the constant terms are -10 and 5, so the sum of these terms is -10 + 5 = -5. Therefore, the correct answer is 3a + 7b - 5.Rate this question:
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- 5.
Hasil pengurangan 6m + 3n + 8 dari 2m - 5n - 3 adalah ....
- A.
4m + 8n - 11
- B.
4m - 8n - 11
- C.
- 4m - 8n - 11
- D.
- 4m + 8n - 11
Correct Answer
C. - 4m - 8n - 11Explanation
The given expression is subtracting 6m + 3n + 8 from 2m - 5n - 3. To subtract, we change the signs of the terms being subtracted and then combine like terms. Therefore, the correct answer is - 4m - 8n - 11.Rate this question:
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- 6.
Relasi-relasi di bawah ini yang merupakan pemetaan adalah ....
- A.
{(2 , -1), (1 , -1), (1 , -2), (0, -3)}
- B.
{(2 , -1), (1 , -1), (0 , -1), (-1, -1)}
- C.
{(2 , 4), (2 , 3), (2 , 1), (2, 0)}
- D.
{(1 , 8), (2 , 7), (3 , 3), (5, 3), (2, 0)}
Correct Answer
B. {(2 , -1), (1 , -1), (0 , -1), (-1, -1)}Explanation
The given answer {(2 , -1), (1 , -1), (0 , -1), (-1, -1)} is the correct answer because it represents a mapping or relation between the input values and the corresponding output values. In this mapping, all the input values have the same output value of -1, which means that each input value is related to the output value of -1. This is evident from the given set of ordered pairs, where the second element of each pair is always -1. Therefore, this set of ordered pairs represents a valid mapping or relation.Rate this question:
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- 7.
Berikut ini relasi yang bukan merupakan korespondensi satu-satu adalah ....
- A.
Setiap negara dan lagu kebangsaannya
- B.
Setiap siswa dan nomor induknya
- C.
Setiap anak dan kampung halamannya
- D.
Setiap negara dan ibukotanya
Correct Answer
C. Setiap anak dan kampung halamannyaExplanation
The relationship between every child and their hometown is not a one-to-one correspondence because multiple children can come from the same hometown.Rate this question:
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- 8.
Gradien dari persamaan garis 6y - 4x - 5 = 0 adalah ....
- A.
- 3
- B.
- 2
- C.
3/2
- D.
2/3
Correct Answer
D. 2/3Explanation
The gradient of a line is determined by the coefficient of x in the equation. In this equation, the coefficient of x is -4. The gradient is calculated by dividing the coefficient of x by the coefficient of y. So, -4 divided by 6 gives us -2/3. Therefore, the correct answer is 2/3.Rate this question:
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- 9.
Persamaan garis yang melalui titik (2 , 3) dan ( - 1, 0) adalah ....
- A.
Y = x + 1
- B.
Y = x - 3
- C.
Y = 2x - 1
- D.
Y = 1 - x
Correct Answer
A. Y = x + 1Explanation
The equation of the line passing through the points (2, 3) and (-1, 0) can be found using the slope-intercept form of a linear equation, y = mx + b, where m is the slope and b is the y-intercept.
First, we need to find the slope, which can be calculated as (change in y)/(change in x).
Slope = (3 - 0)/(2 - (-1)) = 3/3 = 1
Next, we can substitute the slope and one of the given points into the equation to find the y-intercept. Using the point (2, 3):
3 = 1(2) + b
3 = 2 + b
b = 3 - 2
b = 1
Therefore, the equation of the line passing through the points (2, 3) and (-1, 0) is y = x + 1.Rate this question:
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- 10.
Gradien dari garis yang melalui titik (3 , -2) dan (5 , 6) adalah ....
- A.
- 2
- B.
1
- C.
2
- D.
4
Correct Answer
D. 4Explanation
The gradient or slope of a line is calculated by finding the difference in the y-coordinates divided by the difference in the x-coordinates of two points on the line. In this case, the given points are (3, -2) and (5, 6). The difference in the y-coordinates is 6 - (-2) = 8 and the difference in the x-coordinates is 5 - 3 = 2. Therefore, the gradient is 8/2 = 4.Rate this question:
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Mar 15, 2023Quiz Edited by
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