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Solution of system x + y = 10, 2x + y = ...

Solution of system x + y = 10, 2x + y = 18 and 4x - 3y = 26 is :

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`x+y = 10->(1)`
`2x+y = 18->(2)`
`4x-3y = 26->(3)`
Subtracting (2) from (1),
`2x+y-x-y = 18-10=> x = 8`
`y = 10-8 =>y= 2`
Now, multiplying (1) with 3 and then adding (1) and (3),
`3x+3y +4x-3y = 30+26`
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