Which of the sets of ordered pairs represents a function A = {(1, -2), (3, -5), (5,2), (7,5)}
B = {(4,2), (4, -2), (9,3), (9,-3)}
Only A
Only B
Both A and B
Neither A nor B

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.