Question

1. Solve the following pairs of linear equations
by the method of substitution :
(1) x + y = 7, 5x + 12y = 7​

Answer 1

Answer:

hope this helps you ....

see the above attachment...

Answer 2

By Substitution Method,

$x + y = 7 \: \: eqn.(1) \\ y = 7 - x \: eqn.(2) \\ put \: value \: of \: y \: in \: eqn.(3) \\ 5x + 12y = 7eqn.(3) \\ 5x + 12(7 - x) = 7 \\ 5x + 84 - 12x = 7 \\ - 7x = 7 - 84 \\ - 7x = - 77 \\ x = \frac{ - 77}{ - 7} \\ x = 11 \\ put \: value \: of \: x \: in \: eqn.(2) \\ y = 7 - x \\ y = 7 - 11 \\ y = - 4$

x = 11

y = -4

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