Steve S. answered • 03/26/14
Tutor
5
(3)
Tutoring in Precalculus, Trig, and Differential Calculus
To solve by graphing you have to actually graph the two lines. Then determine the coordinates of the intersection point.
To graph a line you need two or more points. Select x-values, e.g., {-1,0,1}, substitute them into the equation and pair the resulting y-values you get with the x-values that produced them to form (x,y) points. Graph the points; draw a line through them (if the points don't all lie on the same line you've done something wrong; that's why it's good to get at least 3 points).
To get good results from this method you have to be NEAT and EXACT in your coordinate plane setup and graphing of the points and lines. Use graph paper and a straight edge.
