Question

The sum of three numbers is 15. The sum of the first number and three times the second number is 15. The sum of the second number and

the third number is 8. What are the three numbers?

Answer 1

Im not sure if this is correct

x=7

y=8/3

z=16/3

Explanation:

The three equations are

x+y+z=15

x+3y=15

y+z=8

you can use substitution for the first and third equation so it would be

x+8=15

x=7

then use sub for the second equation

7+3y=15

3y=8

y=8/3

and you can finish by using sub for the third equation

8/3+z=8

3z=16

z=16/3

I hope this is correct