John B. answered 04/24/20
Former Math teacher of high school math subjects.
"parallel" means that the line has the same slope. What is the slope?
x + 2y = 6 ------>. y = -1/2 x + 3 ----> m = -1/2
Then use equation formula. y - y1 = m( x - x1). where (x1, y1) is (1, -7)
or use y = -1/2 x + b. and substitute (1, -7) to find b