Make a system of equations:
x+y=31; x-y=7
Solve the left one:
x=7+y
Substitute for the right equation:
7+y+y=31
7+2y=31
2y=24
y=12
Solve x+12=31
x=19
So the two numbers are 19 and 12
the sum of 2 numbers is 31 and the difference is 7 what are the 2 numbers
2 answers
When I say "Solve for the left one", that should say "Solve for the right one"
1 answer