Question 86915
Let x=1st #, y=2nd #


After translation, we get the system of equations:

{{{x+y=1}}} "the sum of two numbers is 1"
{{{x-y=4}}} "their difference is 4"
 

Now lets solve this system by using substitution
*[invoke solving_linear_system_by_substitution 1, 1, 1, 1, -1, 4]


Since {{{x=5/2}}} and {{{y=-3/2}}} this means our first number is {{{5/2}}} and our second number is{{{-3/2}}}