exam Maths Puzzle Numerical Ability

The question says: Determine whether each ordered pair is a solution of y = -2x + 5.

1.) (3, -5)
2.) (2.5, 0)

Please explain how you got the answers. Thanks

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exam Other Question

Describe how solving an absolute value equation such as ∣ 2x -1∣ =3 is similar to solving an absolute value equation such as ∣ 2x-1∣ = ∣ x-5∣ How would you set up and slove the equation -x+y=3, x+y=5?