If y varies directly with X and Y equals 35 when x equals 5 find X when y equals - 7

y varies directly with x means y = kx, where k is the constant value. To find x when y = - 7 first we have to find k, using y = 35 and x = 5

y = kx

35 = k (5)

35/5 = k

k = 7

Find x when y = - 7. Remember k is constant and it stays 7.

y = 7x

-7 = 7x

-7/7 = x

x = - 1

Answer: x = - 1 when y = - 7