Question

2x+7y=39 3x+5y=31 by elimanation by substitution

Answer 1

$2x + 7y = 39........1 \\ 3x + 5y = 31.........2 \\ from \: eqn \: 1 \: \\ x = \frac{39 - 7y}{2} \\ putting \: above \: value \: in \: equation \: 2 \\ 3( \frac{39 - 7y}{2} ) + 5y = 31 \\ 3(39 - 7y) + 10y = 62 \\ 117 - 21y + 10y - 62 = 0 \\ 55 - 11y = 0 \\ 11y = 55 \\ y = 5 \\ now \: put \: y \: = 5 \: in \: eqn \: 1 \\ 2x + 7 \times 5 = 39 \\ 2x + 35 = 39 \\ 2x = 4 \\ x = 2 \\ i \: hope \: this \: will \: be \: helpful \: to \: you \:$

Answer 2

2x + 7y =39 ........(1)

3x + 5y =31 .........(2)

Answer : y=5 and

x=2