3. 3x - 4y = 5

6x - 8y =-5

2(3x -4y = 5)

6x - 8y = 10

6x -8y = -5

Therefore there is NO SOLUTION

4. 2x - 7y = 14

x + 3y = 6

2(x + 3y = 6)

2x + 6y = 12

Subtract from first equation and get

-13y = 2

y = -2/13

x + 3(-2/13) = 6

x - 6/13 = 6

x = 6+ 6/13 = 84/13

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