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How do you solve $y = 2 x + 7$ $y=2x+7$ and $y = 5 x + 4$ $y=5x+4$ using substitution?

1 Answer

Jul 9, 2016

$2 x + 7 = 5 x + 4$ $2x+7=5x+4$

Subtract $2 x$ $2x$ from both sides, giving us

$(2 x - 2 x) + 7 = (5 x - 2 x) + 4$ $(2x-2x)+7=(5x-2x)+4$

$7 = 3 x + 4$ $7=3x+4$

Subtract $4$ $4$ from both sides, which finally gives us

$3 = 3 x$ $3=3x$ , so $x = 1$ $x = 1$

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