11. On a coordinate plane, the segment with endpoints (10,40) and (70, 120) is dilated by a factor of 4/5 with the origin as the center of dilation. What is the
length of the resulting segment?
A.
80
B.
100
C.
112
D.
125

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.