You can simplify the equation by dividing by 5 and solving for y giving you y=-x-5. If you were to graph it the slope would be -1, the y-intercept would be (0,-5), and the x=intercept would be (-5,0).
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-5x=3+y x=-1/5y-3/5
2X + 5Y = 6 5Y = - 2X + 6 Y = - 2/5X + 6/5 ----------------------------------and 5X - 2Y = 8 2Y = - 5X + 8 Y = - 5/2 + 4 ------------------- Look like intersecting lines, though not perpendicular
5y explanaition 5x-5x=0, 0-2y=-2y, -2y+7y=5y
Simultaneous equations.