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levineuwirth
Let’s look at the first equation.
Add five to both sides and change it to
Y = x + 5
Now, just substitute this new y value in your second equation
4x - y = 4, or 4x - (x + 5) = 4
Distribute -1 across (x + 5.)
4x -x - 5 = 4
3x - 5 = 4
3x = 9
X = 3

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