Y varies directly as x. If Y= 40 when x = 8, find x when y= -50.

Question

also can you please write a direct variable equation that relates x and y. Help me solve this!

Answer 1

y = kx

 

k = a constant

 

40 = k(8) ⇒ k = 40/8 = 5

 

y = 5x

 

-50 = 5x ⇒ x = -50/5 = -10