Question

If y = –5 when x = 25, find x when y = 45

Answer 1

@lisa-sws i think you forgot to mention if this is directly or inversely proportional..

Answer 2

direct @Igbasallote

Answer 3

the relationship is easy:
\[x= y ^{2}\]
so if y=45
\[x=45^{2} = 2025\]

Answer 4

it's directly proportional

y = kx

when y = -5 then x = 25

-5 = 25k
-5/25 = lk
-1/5 = k

what is x when y = 45

y = kx
45 = -1/5 x
multiply both sides by -5

45*-5 = x

simplify that to get your final answer

Answer 5

i would suggest you post the FULL question to be clear @lisa-sws

Answer 6

Write a direct variation equation that relates x and y. Assume that y varies directly as x. Then solve.

If y = –5 when x = 25, find x when y = 45 @Igbasallote

Answer 7

aahh then use the one i gave you

Answer 8

thanks.