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4x + 5y = -8 is an equation with two variables. While you can solve for y = something, you won't come up with a single number. For example, 4x + 5y = -8 5y = -4x - 8 y = -4x/5 - 8/5. And you can do the same for x = something in terms of y.
If: 20x+5y = 15 Then: y = -4x+3
solv by cramr's rule [ 2x - 5y ] = 2 , [-4x + 10y ] = 1
120x^3y
If you mean: 4x+5y = 40 then y = -0.8x+8 whereas as -0.8 is the slope and 8 is the y intercept of a straight line equation