x = 3
y = 4
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Previous Day  This starter is for 20 August  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 = 22  5x  2y = 7  4y  x = 13 
xy  10 = 2  180  2x + y = 178  20x  3xy = 24 
x^{2} + y = 13  10x  y^{2} = 25  y^{2}  x^{2} = 7 
x^{2}y + 13 = 62  x^{2}y^{2}  2x = 138  x^{2}y^{3} = 576 
x! + y = 10  5(x + y) = 35  3y รท x = 4 
xy
2

84
xy

15y
5x

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The errors are in equations numbered: 4, 11, 13, 20,