# Test Functii

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| By Cristiprof
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Cristiprof
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Quizzes Created: 1 | Total Attempts: 575
Questions: 9 | Attempts: 575

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Test  clasa a VIII-a   Functii

Questions and Answers
• 1.

### Se considera functia liniara a carei expresii este f(x) = 2x - 7. Stabiliti valoarea de adevar pentru afirmatia : "Punctul A( 2: -5) "

• A.

Adevarat

• B.

Fals

Correct Answer
B. Fals
Explanation
The given function is f(x) = 2x - 7. To determine the truth value of the statement "Point A(2, -5)", we need to substitute the x-coordinate (2) into the function and check if the result matches the y-coordinate (-5) of the point.

When we substitute x = 2 into the function, we get f(2) = 2(2) - 7 = -3. Since -3 does not match the y-coordinate (-5) of point A, the statement "Point A(2, -5)" is false.

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• 2.

### Se considera functia liniara a carei expresii este f(x) = 2x +5. Stabiliti valoarea de adevar pentru afirmatia : "Punctul A( 2: 9)  "

• A.

Fals

• B.

Adevarat

Correct Answer
B. Adevarat
Explanation
The statement "Punctul A(2, 9)" is true because when we substitute x=2 into the linear function f(x) = 2x + 5, we get f(2) = 2(2) + 5 = 4 + 5 = 9. Therefore, the coordinates of point A (2, 9) satisfy the given linear function.

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• 3.

### Daca    este un punct pe graficul functiei

• A.

8

• B.

6

• C.

4

• D.

2

Correct Answer
D. 2
• 4.

### Alegeti varianta corecta. Daca

• A.

A =1 si b = 2

• B.

A = 2 si b = 1

• C.

A = 1 si b = 3

• D.

A = 3 si b = 1

Correct Answer
C. A = 1 si b = 3
• 5.

### Pentru functia liniara f  descrisa de relatia  f(x) = 3x - 6 , punctul de intersectie a graficului cu abscisa (axa ox) are coordonatele :

• A.

(0, -6)

• B.

(-6, 0)

• C.

(0, 2)

• D.

(2, 0)

Correct Answer
D. (2, 0)
Explanation
The given linear function is f(x) = 3x - 6. To find the point of intersection with the x-axis, we set f(x) = 0 and solve for x.

0 = 3x - 6

Adding 6 to both sides, we get:

6 = 3x

Dividing both sides by 3, we find:

2 = x

Therefore, the point of intersection with the x-axis has coordinates (2, 0).

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• 6.

### Se considera functia Punctul de pe grafic care are coordonatele egale este :

• A.

( 2 ; 3)

• B.

( 3 : 3 )

• C.

(5; 5)

• D.

(3; 2)

Correct Answer
C. (5; 5)
Explanation
The point on the graph that has equal coordinates is (5, 5). This means that both the x-coordinate and the y-coordinate of this point are the same, which is 5. Therefore, (5, 5) is the correct answer.

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• 7.

### Daca graficul unei functii liniare este dreapta AB unde  A(0:4) iar B(3:0) atunci  distanta de la punctul de intersectie a axelor O la dreapta AB este .... u.

• A.

3,4

• B.

2,4

• C.

5

• D.

7

Correct Answer
B. 2,4
Explanation
The correct answer is 2,4. In this question, we are given that the graph of a linear function is a straight line AB, where A(0,4) and B(3,0). The distance from the point of intersection of the axes O to the line AB can be found by calculating the length of the perpendicular segment from O to AB. By drawing a perpendicular from O to AB, we can see that it intersects AB at the point C(2,4). Therefore, the distance from O to AB is the length of the segment OC, which is 2 units on the x-axis and 4 units on the y-axis, giving us the answer 2,4.

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• 8.

### Punctele A(2, 3) , B( 3, 5) si C(4; 7) sunt coliniare?

• A.

DA

• B.

NU

Correct Answer
B. NU
Explanation
The points A(2, 3), B(3, 5), and C(4, 7) are not collinear because they do not lie on the same straight line. Collinear points are points that lie on the same line, but in this case, the three points do not form a straight line. Therefore, the correct answer is "NU" (NO).

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• 9.

### Fie f si g doua functii liniare , daca f(x) = 2x + 1   si g(x) = -x +1 reprezentate in acelasi sistem de axe , atunci punctul de intersectie a celor doua grafice are coordonatele ...

• A.

( 0,1)

• B.

(1,0)

• C.

(1,1)

• D.

(0,0)

Correct Answer
A. ( 0,1)
Explanation
The intersection point of two linear functions can be found by setting the two functions equal to each other and solving for the variable. In this case, setting f(x) equal to g(x) gives 2x + 1 = -x + 1. Simplifying this equation gives 3x = 0, which implies that x = 0. Plugging this value back into either of the original functions gives y = 1. Therefore, the coordinates of the intersection point are (0, 1).

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 25, 2014
Quiz Created by
Cristiprof
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