y=4x*2
y=8x
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x(4x-2)
4x - 5y = -2 so 5y = 4x + 2 or y = 4/5x + 2/5 Now that it is in the standard form, the slope is the coefficint of x ie 4/5.
5x x 4x = 20x^2 5x + x + 4x = 10x
x = 4.5
Well By what i can guess with your representation you want (x-2x)^2 =x^2+4x^2-4x^2=x^2