Given the formula y = 2x + 3, we can test to see whether the solution (4,10) works.
Remember that in (4,10), the first number is the x number so this means that
x = 4 and y = 10
We substitute x = 4 into the formula to see whether it gives y = 10.
y = 2x + 3
y = 2 times x + 3
y = 2 x 4 + 3
y = 8 + 3
y = 11
So x = 4, y = 10 does not fit.
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