0
"Solve" means find the numbers that 'x' and 'y' represent.
Since there are two of them, you need two equations to find them.
With only one equation, there are an infinite number of correct answers.
Here are a few of them. For each pair of numbers, 4 times the first one
minus 5 times the second one adds up to 20.
5, 0
6, 0.8
7, 1.6
8, 2.4
9, 3.2
10, 4
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