Question

2x+6y=8,x-2y=15 substation method ​

Answer 1

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2x+6y=8,x-2y=15 by substitution method

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$= > 2x + 6y = 8$

$= > x = \frac{8 - 6y}{2} ...(i)$

$= > x - 2y = 15$

putting X's value from Equation1

$= > \frac{8 - 6y}{2} - 2y = 15$

$= > \frac{8 - 6y - 4y}{2} = 15$

$= > 8 - 10y = 30$

$= > - 10y = 22$

$\bold{ = > y = - \frac{22}{10} = - \frac{11}{5} .....(ii)}$

Putting Y's value from Equation2 in Equation1

$= > x = \frac{8 - 6y}{2}$

$= > x = \frac{8 - 6 \times - \frac{11}{5} }{2}$

$= > \frac{ - 48 - \frac{11}{5} }{2}$

$= > x = \frac{ - 240 - 11}{ \frac{5}{2} }$

$\bold{ = > x = - \frac{251}{10} }$

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