Question

Solve the system algebraically.

2x + y - 10 = 0
x - y - 5 = 0

What is the value of y?

Answer 1

let x=2+n
let y=-3+n

Answer 2

plug in and solve for n to determine x and y

Answer 3

how?

Answer 4

whereever you see an x or y, plug in the values for them that have been defined.

then you only have to determine the solution of 1 variable instead of 2 ....

Answer 5

2x + y - 10 = 0
x - y - 5 = 0


2(2+n) + (-3+n) - 10 = 0
(2+n) - (-3+n) - 5 = 0

solve for n