Question

Solve the following system of equations
x+3y=7 (1)
x=9-3y (2)
Solution should be an ordered pair.

Answer 1

no solutions..

Answer 2

9-3y+3y = 7
9 = 7
thats false

Answer 3

Grrrrrr...

Answer 4

Well that's better, but still.

Answer 5

So you put the two equations together?

Answer 6

yea.. substitute for x in the 1st eqn..

Answer 7

You can alternatively add the equations..

x + 3y = 7
+ -3y + 9 = x
============
x + 9 = 7 + x

So we have:

x + 9 = x + 7

Which is impossible.

Answer 8

ahhhh that makes sense