You can't simplify that. And you can only calculate a numeric value if you know what values the variables have.
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This is a linear expression in two variables. There is no equation (nor inequality) so nothing to solve or to change the subject.
There is not a way to give the answer to this equation. You will have to give me the value of the letters.
If 8x + 4y = 16, then y = - 2x + 4 Thus the slope is -2 and the intercept is 4.
x^2-8x+3 = x^2-8x+16-16+3 = (x-4)^2-13 y=(x-4)^2 -13 The vertex is (4,-13).
The given expression can't be solved as equations because there are no equality signs.
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