X=4.2666666666667
7x is still the slope, no matter what x equals.
7x+x = 8x
7x+7=28x 28x-7x=7 21x=7 x=3
7x/3 = 105 7x = 315 x = 45
x = 8
6x+x = 7x
x=6
-8 + 7x = x - 506x = -42x = -6
7x+17 = 45 7x = 45-17 7x = 28 x = 4
7x + 2 = 5,6
-7x + 5 = -9 -7x = -14 7x = 14 x = 2