Question

If y = 2 when x = –4, find x when y = 20.

Answer 1

-40

Answer 2

2/-4 = 20/x
cross multiply
2x = (20)(-4)
2x = -80
x = -40

Answer 3

set up something like a proportion:

so if y = 2(x) = 20
x would = 10

and if you multiply -4 x 10 ur answer is -40

Answer 4

If y = 36 when x = 9, find x when y = 52

Answer 5

04 / 2 = -2. 20 x -2 = -40. Thus, x = -40 when y = 20

Answer 6

*-4

Answer 7

36/9 = 52/x
cross multiply
36x = (52)(9)
36x = 468
x = 468/36
x = 13

Answer 8

@texaschic101 these are the possible answers
a.

y = –4x; –13

c.

y = 4x; 10.4


b.

y = 3x; 13

d.

y = 4x; 13

Answer 9

D. y = 4x ; 13