2x + 3y - x + 5y
combine the like terms
2x - x + 3y +5y
simple arithmetic
x + 8y
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3x/7 + 5y/14x = 3x*2x/(7*2x) + 5y/14x = (6x2 + 5y)/14x
3x - 8y + 2x - 5 - 5y = 5x -13y - 5
4x-2y
2x - 5y = -10 So 5y = 2x + 10 and therefore y = (2/5)*x plus something So the slope is 2/5 or 0.4
2x+5y=20 Solve for y -2x -2x 5y=20-2x 5 5 5 y=4-2x 5