exam Maths Puzzle Numerical Ability

The Quotient of triple a number increased by 4 and 2 is equal to 14. Find the number.

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I am struggling with these two problems:

a) Which of the following is not an expression? 4r = 5; 15r + 18; 24r - 12; 18r divided by 9


b) Evaluate the expression if x=3 and y = -1
6x (exponent 2) + 22xy + 20y(exponent 2)
im lost again. the instructions say to graph each equation. the problem is

y=4

how do i graph the equation if there is no x?