exam Maths Puzzle Numerical Ability

3x-4y=7
2x-y=3

then
3x-4y=7
-8x+4y=-12

adding

-5x=-5 then x=1 then 3-4y=7 then 4y=-4 then y=-1
Solution: x=1,y=-1

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exam Other Question

20 men can plant 50 saplings in 8-hours. In how many hours can 15men plant 80
saplings? Please help.

Solve the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.

x + 5y = 10
- 2x - 10y = - 20

Thanks
JMS