Question

Solve the system of linear equations below.
2x + y = 5
x + y = 4

answers:
x = 1, y = 3
x = 1, y = 5
x = 3, y = 1
x = 9, y = -5

Answer 1

Subtract second equation from first.

Answer 2

\[x = 5 - 4 = 1\]

Answer 3

Now you plug in the value of \(\rm x\) into the second equation.\[\rm 1 + y = 4\]

Answer 4

What do you get as a solution to the above?

Answer 5

x=1, y=4?

Answer 6

Erm... nope

Answer 7

What is the solution to \(\rm y + 1 = 4\)?

Answer 8

idk

Answer 9

What plus 1 equals 4?

Answer 10

3

Answer 11

Yes, so \(\rm y = 3\).