Test Functii
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. FalsExplanation
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.Rate this question:
-
- 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. AdevaratExplanation
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.Rate this question:
-
- 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).Rate this question:
-
- 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.Rate this question:
-
- 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. 2,4Explanation
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.Rate this question:
-
- 8.
Punctele A(2, 3) , B( 3, 5) si C(4; 7) sunt coliniare?
- A.
DA
- B.
NU
Correct Answer
B. NUExplanation
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).Rate this question:
-
- 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).Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Feb 25, 2014Quiz Created by
Cristiprof
Back to top