6 ( I )
Q.6. Solve the following pairs of equations:
(i) 5m - 5n = 12; 2m + 9n = 20

i.5m - 5n = 12     .....12m + 9n = 20     ......2Multiply 1 by 9 and 2 by 5, we get45m - 45n = 108    ....310m + 45n = 100    .....4Adding 3 and 4, we get55m = 208m = 20855Put the value of m in 2, we get2×20855 + 9n = 2041655 + 9n = 209n = 20 - 416559n = 1100 - 416559n = 68455n = 7655

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