Question

If y varies directly as x, and y = 15 as x = -3, find y for the x-value of 6.

Answer 1

y varies directly as x

so

y = kx

for some fixed number k

Answer 2

also, please don't ask the same question 4 times, thanks

Answer 3

y = kx

15 = k(-3) ... plug in x = -3 and y = 15

15 = -3k

solve for k

Answer 4

K= -5
@jim_thompson5910 ?

Answer 5

correct

Answer 6

now you know k = -5, you know the equation is y = kx ---> y = -5x

Answer 7

so if you want to know the value of y when x = 6, just plug it in

y = -5x

y = -5*6

y = ??

Answer 8

y= -30
thanks @jim_thompson5910

Answer 9

yw