A 21 foot ladder is leaning up against a wall. The ladder makes a 13° with the ground. How far is the base of the
ladder from the bottom of the wall?

Cos13°=x/21
0.9=x/21
x=18.9
Thus, the base of the ladder is 18.9 feet away from the bottom of the wall

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.