Question

X + y = 7, 3x - y = 1​

Answer 1

Answer:

$x + y = 7 \\ y = 7 - x$

put in 2 equation

$3x - (7 - x) = 1 \\ 3x - 7 + x = 1 \\ 4x = 1 + 7 \\ 4x = 8 \\ x = 2$

$y = 7 - x \\ x = 2 \\ y = 7 - 2 \\ y = 5$

Step-by-step explanation:

answer and explanation given

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