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Mathematics, 13.10.2019 09:10 gbrightwell

2x + y = 7
y = x + 1
when the expression x+1 is substituted in for y in the first equation, the result is

x + 1 = 7
2x + 1 = 7
3x + 1 = 7

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2x + y = 7
y = x + 1
when the expression x+1 is substituted in for y in the first equati...
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