How do you calculate constant rate of change from a proportional graph given the
coordinates (x, y)?
a. xy

b. x/y

c. y/x

d. y+x

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.