book Maths Puzzle Numerical Ability

This one is addition instead of substitution. I couldn't find the right place to put it. This one is just as confusing to me.

1/3*x - 1/2*y = 5/6
1/2*x - 2/5*y = 9/10

Thank

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book Other Question
If a cost equation for a product is given by C=2x^2+32, how would you find the marginal cost?

Any help would be greatly appreciated. Thank you. Subject: Financial Management
Problem #1

An investor recently purchased a corporate bond which yields 9 percent. The investor is in the 36 percent combined federal and state ta