exam Maths Puzzle Numerical Ability

What are the steps for solving this problem:

Solve the linear system of equations-

3x + 7y = 15
-5x + 2y = 16

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exam Other Question

This is a word problem that i am not so good with can someone please help! The cost of a new car is $18,000 this year. If the annual rate of in inflation is 5%, what would a new car be expected to cost in 5 years? 6a + 3+ 2a = 11