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If x + y = 10 and y = x + 8
Substitute y = x + 8 into x + y = 10
Which gives; x + x + 8 = 10
So; 2x + 8 = 10
( - 8 from both sides); 2x=2
So: x =1. Substitute back into y = x + 8
And therefore y = 1 + 8 ; y=9
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∙ 13y ago
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