Question

The sum of the two numbers is 12. The difference is 18. Write a system of equations to represnt the statement and what are the two numbers​

Answer 1

x = 15 and Y = -3 because X + Y = 12
X - Y = 18
__________
2X = 30
X = 15
15 + Y = 12
Y = -3
You can substitute the X value into either equation from the first two equations