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4x - 5y = 4 & 6x - 7y = 10
This is a pair of simultaneous equations. Re-write as
4x - 5y = 4
6x - 7y = 10
To find the value of 'x; we need to eliminate 'y'
To do this multiply the top eq'n by '-7' and the bottom equation by '5' . This brings the coefficients of 'y' to the same value, but one is plus(+) and the other is negative(-).
Hence
-28x + 35y = -28
30x - 35y = 50
Add the two eq'ns, this will eliminate 'y'
2x = 22
x = 11
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