x = 3
y = 4
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Previous Day  This starter is for 20 April  Next Day
There are of course no end of correct answers and here are some examples.
There is at least one mistake. Can you find the errors when x=3 and y=4?
\(x + y = 7\)  \(x  y = 1\)  \(y  x = 1\) 
\(2x + 3y = 18\)  \(5x  2y = 7\)  \(4y  x = 13\) 
\(xy  10 = 2\)  \(180  2x + y = 178\)  \(20x  3xy = 24\) 
\(x^2 + y = 23\)  \(10x  y^2 = 25\)  \(y^2  x^2 = 7\) 
\(x^2y + 13 = 49\)  \(x^2y^2  2x = 138\)  \(x^2y^2 = 576\) 
\(x! + y = 10\)  \(5(x + y) = 52\)  \(3y \div x = 22\) 
\(\frac{xy}{2}= 6\)  \(\frac{84}{xy}= 7\)  \(\frac{15y}{5x}= y\) 
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