If f(x) = x + 1, and g(x) = 2x,
then
gf(x)) = ?

2x(x+1)
Distribute
2x^2+2x

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.