SOLUTION: Solve the system by graphing. 3x + y = �1 9x + 3y = �3

Question 85023: Solve the system by graphing.
3x + y = �1
9x + 3y = �3

Answer by tutorcecilia(2152) (Show Source): You can put this solution on YOUR website!
3x + y = �1 [re-write in the slope-intercept format (y=mx+b)]
3x -3x +y=-1 -3x
y=-3x-1
and
9x + 3y = �3 [re-write in the slope-intercept format (y=mx+b)]
9x-9x+3y=-9x-3
3y=-9x-3
3y/3=-9x/3- 3/3
y=-3x-1
.
Graph both equations. Since both equations are the same, they are the same line and will show up on the graph as a single line. The y-intercept will be (0, -1). The x-intercept will be (-1/3, 0) and the slope will be (-3/1) and 3/-1).

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