You can put this solution on YOUR website! Get each equation in slope-intercept form, define two points for each, draw the graphs. The point where the cross is the solution of the system of equation.
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2x -y = 11
-y = -2x + 11
y = 2x -11
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2x + 3y = 7
3y = -2x +7
y = -(2/3)x + 7/3
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So, the point (5,-1) is the common solution.
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2(5)-11 = -1, correct
-2/3*5 + 7/3 = -1, correct
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Done.