book Maths Puzzle Numerical Ability

what is the answer to y=3x+3
3x+2y=-12
I tried to figure it out and got an answer can you tell me if its right

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book Other Question

Your bank is offering a CD at an annual interest rate of 6.0%. Since you expect that rate to be highter than he prevailing interest rates for a long time, you plan to deposit $10, Kendra has 9/8 of a bowl of soup. She gives 3/4 of what she has to Scottie. what fraction of a whole bowl of soup does Scottie get? what fraction of the whole bowl does Kendra get?