Question

Find the value of (x+y) if 3x+4y=11 ; 4x+3y=10

Answer 1

$\times 4 = 3x + 4y = 11 \\ \times 3 = 4x + 3y = 10 \\ \\ \\ 12x + 16y = 44 \\ - 12x - 9y = 30 \\ i \: changed \: the \: signs \: \\ = 7y = 14 \\ y = 2 \\ \\ substituting \: y = 2 \: in \: equation1 \\ we \: get \\ 3x + 4(2) = 11 \\ 3x + 8 = 11 \\ 3 x = 3 \\ x = 1.$

Answer 2

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