Question

*fan and medal awarded*

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?
3x + y = 8
-x - 2y = -10

-2y + 10
2y + 10
2y - 10
-2y - 10

Answer 1

how do u add x

Answer 2

what is x. x isnt a number so i cant add it. please explain.

Answer 3

-x - 2y = -10


Shift x to the other side of the '= sign'

Answer 4

okay after adding x what would iget cuz your not really helping. i can do the add 10 thing

Answer 5

Ok add 10 :)

Answer 6

what do i get after adding x.

Answer 7

You would try to isolate the x term:
-x - 2y = -10 First move the -2y over
+2y +2y
----------------
-x = 2y - 10 Now get rid of the negative on the x by dividing by -1
-----------
-1
x= -2y + 10 <-- this is what you would plug in