exam Maths Puzzle Numerical Ability

solve 5x+6y=18 for y thanks

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Could you kindly help me.

True or False. Explain your answer.
For the equation, 3x2 = 4x - 7, we have a = 3, b = 4, c = -7 factor: 45xyz^2+5x^2yz^2+100yz^2