Question

solve x+4y=3 2x+9y=5​

Answer 1

Step-by-step explanation:

$x+4y=3 (multiply \: by \: 2) \\ 2x + 8y = 6 \: \: \: \: \: \: ......1\\ 2x+9y=5 \: \: \: \: \: \: .......2 \\ subtract \: 2 \: from \:1 \\ 2x + 8y - (2x + 9y) = 6 - 5 \\ 2x + 8y - 2y - 9y = 1 \\ - 1y = 1 \\ y = - 1 \\ now \: put \: the \: value \: of \: y \: i n\: x + 4y = 3 \\ x + 4( - 1) = 3 \\ x - 4 = 3 \\ x = 3 + 4 \\ x = 7$

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