exam Maths Puzzle Numerical Ability

How do I find the ordered pairs for this equation 2x+y=10 I am not sure how to start I think I SOLVE X AND THEN Y.aM I CORRECT?

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exam Other Question

6x + 2y + z = 6 (1)
3x + 4y + 5z = 12 (2)
2x + 7y + 4x + 12.25 (3)

Help!!! One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together?