Figure XYZ is a triangle with a base of 12 inches. If XYZ is dilated by a scale factor of
1.5, what will be the length of AX'YZ's base?

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.