Ive tried to do the problem but i got confused
When generalized, slope-intercept form is: y = m x + b
We have the slope, m = -2, but we still need the y-intercept, b, to complete the equation.
But we do have a point on the line, (10,-9). And if that point is on the line, it must satisfy the equation.
So it must be true that:
(-9) = -2(10) + b [multiply]
-9 = -20 + b [add 20]
11 = b
Now we know both the slope, m = -2, and the y-intercept, b = 11;
so our equation is: y = -2x + 11