exam Maths Puzzle Numerical Ability

Solve following systems by addition

2x+3y=1
5x+3y=16

2x+3y=1
-5x-3y=-16
-3x=-15
x=-5

Double checking to see if these are right?

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exam Other Question

pls help me understand this problem: Find a number that is 68 greater than three times its opposite. Can someone help me with this problem?

I need to divide. and write the result in simplest form:

9/10 divided by 12/5

Thanks,
Lyn