Answer:
y = 9x + 9
Step-by-step explanation:
If the equation cuts through the x-axis at x = -1, the point is (-1, 0).
Point are written (x,y). In (-1, 0), x = -1 and y = 0
Equations of lines (in slope-intercept form) are written as y=mx+b.
x and y are for points on the line, like (-1, 0).
m is the slope, we know is 9.
b is the y-intercept, which we need to find.
Substitute m=9, x=-1, y=0 into the equation
y = mx + b
0 = 9(-1) + b Multiply -1 and 9
0 = -9 + b Add 9 to both sides to isolate b
b = 9
Substitute b=9 back into the equation with the slope.
y = 9x + 9
