Question

5x+4y=9 -----(I) and 4x+5y =18 -----(II)Then find x+y

Answer 1

Answer:

Your answer attached in the photo

Answer 2

Answer:

$5x + 4y = 9$

$= > x = \frac{9 - 4y}{5} \: \: \: \: \: \: \: \: \: - > (i)$

$4x + 5y = 18$

$= > 4( \frac{9 - 4y}{5} ) + 5y = 18$

$= > 36 - 16y + 25y = 90$

$= > 9y = 54$

$= > y = 6$

$(i) = > x = \frac{9 - 4 \times 6}{5}$

$\: \: \: \: \: \: \: \: = > \frac{9 - 24}{5}$

$\: \: \: \: \: x = - 3$

$∴x + y = - 3 + 6 = 3$

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