well first you combine the x's, which would mean you have to add -2x and 5x which results 3x+7=10, then, you subtract 7 from 10, and get 3, and all you have is this : 3x=3 which would mean that x=1
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2x+a=p 2x=p-a x=.5p-.5a
2x+8=10... Subtract 8 on both sides, then devide by 2... 2x=2... x=1
you need 2 equations to solve for 2 variables
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If: 2x+5y = -10 Then by subtracting 2x from both sides: 5y = -2x-10 And dividing all terms by 5: y = -2/5x-2 which is now in slope intercept form