The value of x and y vary directly, and when x= 4 y equals -10. find the value of y when x equals 10.

y = - 25

since x varies directly with y then we can express the relationship as

x = ky ← k is the constant of variation

to find k use the given condition y = - 10 when x = 4

k = = = -

hence x = - y

when x = 10

10 = - y

multiply both sides by - 5 and divide both sides by 2 )

- 50 =  2y ⇒ y = - 25

12cm

the answer is d

4+4+2x

or

2x+8

step-by-step explanation: