Explain your answer !!

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Explanation; Solve by substitution
1) Solve for y in 2x + y = 3
Y= 3 - 2x
2) Substitute y=3-2x into y= x-3
3-2x=x-3
3) Solve for x in 3 - 2x = x - 3
X=2
4) Substitute x = 2 into y = 3 - 2x
Y=-1

Answer;
X=2
Y=-1

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