2x-3y=13 , 7x-2y=20 subtiution method and elimination method
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2x-3y=13...(1)
7x-2y=20...(2)
by eq.(1)×2 & (2)×3....
4x-6y=26.......(3)
21x-6y=60......(4)
on subtracting eq.(3) from eq. (4)....
17x=34
x=2
on putting the value of x in eq(1)
2×2-3y=13
-3y=13-4
-3y=9
y=-9/3
y=-3
so,x=2
y=-3 Ans
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