You can put this solution on YOUR website! Well, you it's already in Slope-intercept form, that makes it a little easier.
For the first line,
-3 is your y-intercept
1 is your slope
Second line:
1 is your y-intercept
2 is your slope
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Then you place those points on a graph
The place where the two lines intercect is your solution
In this case, the intercection point is (-4,-7)
So, on the line, you write (-4,-7) and on the graph grid, you draw the graph.
Hope this helps!