What are the values of x and y in the following system of equations?

Step-by-step explanation:

By elimination method,

x+y=15

-x+y=5

2y=20

i.e y=10

Now,

x+y=15

or, x+10=15

or, x=5

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,