exam Maths Puzzle Numerical Ability

Which of the ordered pairs
(-11, 3), (1, 0), (-7, -2), (-19, 5)
are solutions for the equation x + 4y = 1?

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exam Other Question

An airplane left an airport flying at at 180 mph. A jet that flies at 333 mph left 1 hour later. The jet follows tthe same route as the airplane on parallel altitudes. How many hours will it take the jet to catch up with the airplane? An investor receives $600 annually from two investments. He has $500 more invested at 8% than at 6%. What is the amount invested at each rate?