To solve for 3 unknown variables you need 3 independent equations. You have only 1.
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2y = -6x + 8 The y intercept occurs when x = 0 2y = 8 therefore y = 4
4x+2y-8=0 2y=8-4x y=4-2x slope= -2
x = -8, y = 10
3x + 2y = 8 2y=8-3x y=4-1.5x A quadratic has x^2 This is the equation of a line with negative slope.
5y+8=7y 2y=8 y=4