Solve x^2 - 4 = 77.
x= _/173 or x= - _/73
x = 9 or x = -9
x = 11 or x = -7
x = 9i or x = -9i

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.