How do you solve $4x + y = 8$ and $y = 4x$ using substitution?

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Answer 1 · 2016-07-20T21:41:51

$x = 1, y = 4$

The y values in both equations are the same.
MAke y the subject in each equation.

$y = -4x+8" and " y = 4x$

Now, $" "y " " = subst for each "y$

$:. -4x +8 = 4x$

$8 = 8x$

$x=1$

If $x= 1$ , then $y = 4 xx1 = 4$

How do you solve 4x + y = 84x + y = 8 and y = 4xy = 4x using substitution?