6x+7y=4x+4y

(where y is - 4 and the value of x is unknown)

find the value of x

x = 6

Step-by-step explanation:

Substitute y = - 4 into the equation and solve for x

6x + 7 ( - 4) = 4x + 4 ( - 4) ← evaluate

6x - 28 = 4x - 16 (subtract 4x from both sides)

2x - 28 = - 16 (add 28 to both sides)

2x = 12 (divide both sides by 2)

x = 6