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2x+y=13. 4x-y=5
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2x+y=13. equation 1
4x-y=5. equation 2
equation 2nd by 2
2x-2y=10. equation 3
add equation 1st and 3rd
2x+y=13
2x-2y=10
3y=3
y=3\3
y=1
put y=1 in equation 1st
2x+1=13
2x=13-1
2x=12
x=12\2
x=6
x=6. y=1
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