Answer:
x = - 7
Step-by-step explanation:
x = 18 is the equation of a vertical line parallel to the y- axis
A parallel line must also be a vertical line with equation
x = c
where c is the value of the x- coordinate the line passes through
The line passes through (- 7, 9 ) with x- coordinate - 7 , then
x = - 7 ← equation of parallel line
