Answer:
y = (1/2)x - 21/2
Explanation:
since both lines are parallel, both have the slope 1/2.
Start with the equation y = mx + b, and find b, when m = 1/2, x = 9 and y = -6:
-6 = (1/2)(9) + b
Mult. all terms by 2 removes the fractional coefficient 1/2:
-12 = 9 + 2b.
Then -21 = 2b, and b = -10 1/2, or -21/2.
The equation of the line is y = (1/2)x - 21/2.