Question

Функция задана формулой y=4x-5 принадлежит ли графику (-4;21)?

Answer 1

y = 4x - 5       (- 4 ; 21)

x = - 4      y = 21

21 = 4 * ( - 4) - 5

21 = - 16 - 5

21 = - 21 - неверно

Точка с координатами (- 4 ; 21) не принадлежит графику функции

y = 4x-5

Answer 2

To check whether the point (-4, 21) belongs to the graph of the function y = 4x - 5, we need to substitute the x-coordinate (-4) into the equation and see if it gives us the corresponding y-coordinate (21). If it does, then the point belongs to the graph; if not, it does not belong.

Let's check:

For x = -4:

y = 4(-4) - 5 y = -16 - 5 y = -21

The calculated y-coordinate is -21, not 21. Therefore, the point (-4, 21) does not belong to the graph of the function y = 4x - 5.