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It's an algebraic expression that can be simplified to: x-5y
x - 5y = -4 x + 8y = -4 The first equation gives x = 5y - 4 SUBSTITUTE this value for x in the second equation: (5y - 4) + 8y = -4 Simplify: 13y = 0 so that y = 0 Then x = 5y - 4 gives x = -4
3y+5.2=2-5y 8y=-3.2 y= -0.4
8y-3x
x+8y=28 -3x+5y=3