exam Maths Puzzle Numerical Ability

can you assist me to solved the following :
1. Solve the syatem of linear equaion by graphing. 4x-y=6 and 3x+y=1

2. use elimination to solve: 4x-y=-3 and 5x+2y=-20

3.

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exam Other Question

Four points X, Y, Z, and W are located so that OX = 7 OY + 4 OZ -10 OW for a point O. Prove, from first principals, that the points are coplanar. With only the small valve open, all of the liquid can be drained from a large vat in 4 hours. With only the large valve open, all of the liquid can be drained from the same vat in 2 hours. How long would it take to drain the vat with both valves open?