Question

solve by substitution method x+y=7, x-y=2​

Answer 1

Hey mate ,

$x + y = 7 \: \: \: \: \: \: \: \: \: \: (1)$

$x - y = 2 \: \: \: \: \: \: \: \: (2)$

$from \: eqn \: 2$

$x = 2 + y \: \: \: \: \: \: \: \: \: (3)$

$putting \: value \: of \: x \: in \: eqn1$

$2 + y + y = 7$

$2y = 5 \\ y = \frac{5}{2} \\ y = 2.5$

$putting \: this \:value \: in \: eqn \: 3$

$x = 2 + 2.5 \\ x = 4.5$

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Answer 2

y=7-x

put in equation 2

x-{7-x}=2

x+x-7=2

2x=9

x=9/2

9/2-y=2

-y=2-9/2

-y= -5/4

y=5/4