book Maths Puzzle Numerical Ability

Hi Tutors, it's me again I need help with the following problems can you help me. Thank you so much.

y=3x+2

x=5x

y=2x+1

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Complete the follow equation. Your answers will be algebraic expressions. (a+bi)^2= ??? + ??? i hilary is trying to determine the cost of health care to college students and parents' ability to cover those cost. She assumes that the cost of one year of health for a college s