Asked by lucia

the sum of 2 numbers is 31 and the difference is 7 what are the 2 numbers
Answered by AJ L
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
Answered by AJ L
When I say "Solve for the left one", that should say "Solve for the right one"
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