exam Maths Puzzle Numerical Ability

Natalie has some nickels, Dirk has some dimes, and Quincy has some quaters. Dirk has five more dimes than Quincy has quaters. If Natalie gives Dirk a nickel, Dirk gives Qunicy a di

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hello,

how to solve by graphing:

2x - 3y = 12
3y - 2x = -12

thank you. Please help me solve this problem:

2. (4 points) Write down all possible subsets of {a, b, c, d}