book Maths Puzzle Numerical Ability

Could you help me solve this problem.. 10x-2y=4

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Please show me how to solve the following equation:

6x + 7 = 8x - 13

Thank you! 1. Find the projection of the vector v1= (0,1,1) onto the line defined by the vector v2= (1,1,0)

2i) Find an orthogonal basis of the subspaces span (v1,v2), where v1 and v2 are