It is: 2x squared +5x -7 = 0 and the value of x = -7/2 or 1
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2x+y=1
If you mean -2x+y = 8 then y = 2x+8 as a straight line equation
In standard form it is 4x - 4y = 6 or 2x - 2y = 3
2x+12-3x = 5 2x-3x = 5-12 x = -7
y + 4 = 2x −1