exam Maths Puzzle Numerical Ability

How do I solve 5x+4=7 and x-3y=9. I have to find the graph

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you are playing a game of billiards on a standard 92" x46" pool table. the ball is currently 10 inches down and 12 inches to the right of the top left pocket. You call that you wil Is the given number a solution of the equation?

9k = 10 - k; -1

-7r - 15 = -2r; -3

-3p = 4p + 35; -5

8 -e = 2e - 16; 8

5 - 15s = 8 - 16s; 3

2(x - 2) - 5x = 5(2 - x); 7

6a + 3 = 3(3a - 2); 4