plug in x value with given value
-7(-9)+8y=39
63+8y=39
move the 63
8y=39-63
subtraction
8y=-24
division
y=-3
Complete the solution of the equation. Find the value of y when x equals -9.
-7x + 8y = 39
The value of y is -3
-7x + 8y = 39
Substituting x = -9 in the equation,
=> -7(-9) + 8y = 39
=> 63 + 8y = 39
=> 8y = 39-63
=> 8y = -24
=> y = -24/8
=> y = -3
