exam Maths Puzzle Numerical Ability

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.

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exam Other Question

what is the equation of the linewhich passes through the point (-5,-2) and which is parallel to the line 6x-3y=10 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.