exam Maths Puzzle Numerical Ability

Hi, can someone help me with this problem?

Solve for x and y: 2x + 3y = 1
5x + 3y = 16

Thanks.

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exam Other Question

Suppose n is positive integer. Then (n^2+n)(2n+1)

option
may not be divisible by 2
is always divisible by 2 but may not be divisible by 3
is always divisible by 3 but may not be divisible by 6
is always divisible by 6

concert tickets: tickets for a concert cost $5, $3, and $2. twice as many $5 tickets were sold as $2 tickets. the recipts for 750 tickets were $2625. haw many of each price ticket were sold? [i have no clue how ti set this up]