Graphing
Steps:
| 1) find the x and y intercepts of both equations |
| 2) graph the equations |
| 3) find the point of intersection |
Example: Solve the system of equations
3x + 9y = 18 equation 1
2x + 4y = 8 equation 2
1) find the x and y intercepts of equations 1 and 2
3x + 9y = 18 write equation 1
3(o) + 9y = 18 solve for y by plugging in 0 for x
(0,2)
3x + 9y = 18 write equation 1
3x + 9(0) = 18 solve for x by plugging in 0 for y
(6,0)
2x + 4y = 8 write equation 2
2(0) + 4y = 8 solve for y by plugging in 0 for x
(0,2)
2x + 4y = 8 write equation 2
2x + 4(0) = 8 solve for x by plugging in 0 for y
(4,0)
2) graph using the x and y intercepts found in step 1
3) find the point of intersection
the answer is (0,2)