x - 2x + 10 + 4x = 70
Combine like terms: 3x + 10 = 70
Subtract 10 from both sides: 3x = 60
Divided both sides by 3: x = 20
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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
many solutions
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