Question

@optiquest

Answer 1

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?

2x + y = 8
-x - 3y = -12

3y + 12
-3y + 12
3y - 12
-3y - 12

Answer 2

isolate x in the 2nd eqn

Answer 3

-3y=-12+x would now be the second equation right?

Answer 4

keep going till you get ...=x

Answer 5

x=-3y+12

Answer 6

@optiquest

Answer 7

@Nnesha

Answer 8

-3y=-12+x
what would be ur next step ??

Answer 9

idk @Nnesha

Answer 10

\(\color{blue}{\text{Originally Posted by}}\) @help_people
x=-3y+12
\(\color{blue}{\text{End of Quote}}\)
how did you get this ?

Answer 11

I isolated

Answer 12

yeah but how ?? how did you get -3 at right side ?? :-)

Answer 13

I just put it there

Answer 14

-x - 3y = -12
isolate x
so first step would be move *-3y* to the right side how would you do that ?

Answer 15

remember
subtraction ----- addition
multiplication ----->opposite division

Answer 16

add it

Answer 17

yes right add 3y both side :-)

Answer 18

so may you show me what the equation would now be then

Answer 19

what did you get after adding 3y both side ?

Answer 20

?

Answer 21

-x - 3y = -12
add 3y both side let me know what you get

Answer 22

so what would the equation be now? may you show me after you add 3y

Answer 23

-x=-12+3y right

Answer 24

yes right
now there is - with x
so how would you cancel it out ?

Answer 25

idk

Answer 26

the answer is b

Answer 27

-x is same as -1 TIMES x
multiplication --->opposite division

Answer 28

yes divide both side by -1