Question

solve x+y=5 and x-y=8

Answer 1

$x + y = 5 \\ \\ x = 5 - y\: \: \: \: \: \: \: \: - - (1)$


Given, x - y = 8

=> 5 - y - y =8

=> - 2y = 3

=> y = - 3 / 2




Putting value of y in ( x + y = 5 )

=> x + y = 5

=> x - 3 / 2 = 5

=> x = 5 + 3 / 2

=> x = ( 10 + 3 ) / 2

=> x = 13 / 2 or 6.5

Answer 2

Hey friend...!! here's your answer
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$x + y = 5 - - - - - - 1 \\ \\ x - y = 8 - - - - - - 2 \\ \\ solving \: equation \: 1 \: and \: 2 \\ \\ from \: eq. \: 1 \\ \\ x = 5 - y - - - - - - 3 \\ \\ put \: the \: value \: of \: equation \: 3 \: in \: 1 \\ \\ (5 - y) - y = 8 \\ \\ - 2y = 8 - 5 \\ \\ y = - \frac{3}{2} \\ \\ put \: the \: value \: of \: y \: in \: eq \: 3 \\ \\ x = 5 -(- \frac{3}{2} )\\ \\ x = \frac{10 + 3}{2} \\ \\ x = \frac{13}{2} \\ \\ \\ so \: the \: value \: of \: x \: = \frac{13}{2} \: and \: the \: value \: of \: y = - \frac{3}{2}$

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#Hope its help