Question

$2x + y = - 7 \\ - x + y = 8$
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Answer 1

Step-by-step explanation:

$2x + y = - 7 \\ - x + y = 8 \\ \\ so \\ y = 8 + x \\ put \: the \: value \: in \: eq \: n \: 1 \\ \\ \\ 2x + 8 + x = - 7 \\ 3x = - 7 - 8 \\ 3x = - 15 \\ x = \frac{ - 15}{3} \\ x = - 5 \\ \\ \\ \\ put \: the \: value \: in \: eq \: no \: 3 \\ \\ y = 8 + x \\ y = 8 + ( - 5) \\ y = 8 - 5 \\ y = 3 \\ \\ \\ so \\ \\ x = - 5 \\ y = 3$

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