Question

Given that r = 7x+7y find x when y = 2 and r = 8

Answer 1

x = -6/7

Explanation:

We must substitute in the values and solve for x

`r = 7x + 7y\\(8) = 7x + 7(2)\\8 = 7x + 14\\8 - 14 = 7x + 14 - 14\\-6 = 7x\\-6/7 = 7x/7\\x = -6/7`