If y varies directly as x and y = 15 when x=-5, find y when x= 7. A. -21
B. 21
C. 105
D. -35​

B is the correct answer

Step-by-step explanation:

y= 3x from tbe values

so y = 3×7 =21

A. -21

Step-by-step explanation:

y varies directly as x

y = kx

y = 15 when x = -5

Find k, the constant of variation

15 = k(-5)

Divide both sides by -5

-3 = k

k = -3

y when x= 7

using k = -3

y = -3(7)

y = -21

  n=   0.0000 - 0.3750 i  

  n=   0.0000 + 0.3750 i

step-by-step explanation:

one of these should be correct