Question

Write an equation for the following transformation of y = x: a vertical stretch by a factor of 4.

Answer 1

Some of the points for y = x:
(1, 1); (2, 2); (3, 3); (4, 4)

After the transformation, the y coordinates should all be 4 times the x coordinates:
(1, 4); (2, 8); (3, 12); (4, 16)
Can you tell me how the y is related to the x's here?

Answer 2

Oh like 2 times 4 is 8, 3 times 4 is 12, and 4 times 4 is 16..?

Answer 3

Exactly... So can you tell me the equation? y = ????

Answer 4

y = 4x ?

Answer 5

Yes....

Answer 6

Ok, thanks:)

Answer 7

Yw.