exam Maths Puzzle Numerical Ability

Solve the system by graphing.

3x+y=6

3x-y=0

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exam Other Question

Find coordinates for the centroid of the triangle whose vertices are (a) (-1,5), (-2,8) and (3,3); b) (2,7),(8,1) and (14,11); (c) (a,p), (b,q) and (c,r). Can someone help me on this problem?

I need to solve the following systems by substitution:

4x - 12y = 5
-x + 3y = -1

Thanks,
Lyn