Problema Solution
A first number plus twice a second number is 13. Twice the first number plus the second totals 17.
Answer provided by our tutors
Let
x = the first number
y = the second number
A first number plus twice a second number is 13:
x + 2y = 13
Twice the first number plus the second totals 17:
2x + y = 17
We have the system:
x + 2y = 13
2x + y = 17
........
........
x = 7
y = 3
The first number is 7 and the second number is 3.