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only if x=0

-x is the same as -1x
-4x is -4 x
If you had -1 -4 what do you get?

-1 - 4 = ?

-5?

Right, so since -1 - 4 = -5, then -x - 4x = -5x

Now the system. Again, you have the two equations solved for y already, so use substitution.

Do you remember from the two previous systems what to do next?

yes im working ion it

Ok, let me see what you're up to since you're having trouble with it.

ok so i had 2-x=4x+7
2-x +2=4x+7+2
-x=4x+9
-x-4x=9
now im stuck

The 2 on the left side is positive, so you need to subtract 2 from both sides.

2 - x = 4x + 7
2 - 2 - x = 4x + 7 - 2
-x = 4x + 5
Now subtract 4x from both sides

-4-4x=5

-x - 4x = 4x - 4x + 5
-5x = 5

x=-1?

|dw:1356283149364:dw|

right, x = -1

Now insert this value of x in one of the original equations, and solve for y

sorry i had to do something i do it one sec

1,3 ?

y = 3. You're right, but remember x = -1, not x = 1

thanks you!

|dw:1356283635553:dw|

You're welcome.

i think its true

Substitute the ordered pair into both equations. If it makes them both true, it's a solution.

ok i did it its true

Good job!

=D