book Maths Puzzle Numerical Ability

Solve the system by graphing.

3x+y=6
3x-y=0

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book Other Question

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help the sum of two consecutive odd integers is 40 find the numbers