10m-7n=26
7m+7n=42
( No's two)
5x=5+2y
4x=-19-3y
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10m -7n=26
7m+7n=42
on adding,
17m=68
m=4
from 10m -7n=26
10×4 -7n=26
7n=40 -26
7n=14
n=2
therefore
m=4
n=2
5x=5+2y
5x -2y=5. (I)×3
4x+3y=-19. (ii)×2
15x -6y=15. (iiI)
8x +6y=-38. (iv)
on adding,
23x=23
x=1
from eqn (I)
5×1-2y=5
2y=5 -5
y=0
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