1.

ZX + 3y = 9; 3x+4y=5

Answer»

2x + 3y = 9 ......(1)

3x + 4y = 5 .......(2)

3 × (1) - 2 × (2)

6x + 9y = 27

6x + 8y = 10

So, we get

y = 17

So, 2x + 51 = 9

2x = 9 - 51 = -42

x = -21



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