exam Maths Puzzle Numerical Ability

How do you solve a system using the addition method

x+3(y-1)=11
2(x-y)+8y=28

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exam Other Question

I would truly appreciate your help in solving this problem. Thank you in advance for your assistance.
Problem: Solve the system of nonlinear equations.
(x^2+y^2+3y=22 (1)
( Linear System Word Problems

Please help me figure this out.
The cost of 12 oranges and 7 apples is $5.36. Eight oranges and 5 apples cost $3.68. Find the cost of each orange and each apple.

Thank you
Ryan