ax + by = c......a > 0, b < 0, c < 0...this means a is positive and b and c are negative
ax - by = -c
to find the x int, sub in 0 for y and solve for x
ax - b(0) = -c
ax = -c
x = -c/a <== ur x int
ax - by = -c
-by = -ax - c
y = a/bx + c/b.....slope = a/b , y int = c/b <==
