Question

solve:1} 3x + 4y = -5 ; y = x + 4. By eliminating method

Answer 1

$3x + 4y = - 5 \\ \\ y = x + 4 \\ \\ put \: the \: value \: of \: in \: equation \: first \: \\ \\ \\ = > 3x + 4(x + 4) = - 5 \\ = > 3x + 4x + 16 = - 5 \\ = > 7x = - 5 - 16 \\ = > 7x = - 21 \\ = > x = - 3 \\ now \: put \: the \: value \: \: x \: \: in \: second \: eqution \: \\ = > y = x + 4 \\ = > y = - 3 + 4 \\ = > y = 1$

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