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For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?


-x + 2y = -6

3x + y = 8


Answer

2y - 6

-2y + 6

-2y - 6

2y + 6

Verified Answer :

JcAlmighty

The answer is 2y + 6

-x + 2y = -6
3x + y = 8

Let's isolate x in the first equation:
-x = - 2y - 6

Now, multiply both sides by (-1)
x = 2y + 6

mariamtomori

Answer:

x = 2y + 6 =3.14

Step-by-step explanation:

for substitution method

-x + 2y = -6             ........................................................(1)

3x + y = 8               ........................................................(2)

make x the subject of the equation 1 by isolating it

x = 2y + 6               ........................................................(3)

substitute eqn 3 in 2

3(2y + 6) + y = 8      ........................................................(4)

6y + 18 + y = 8

7y = 8-18=-10

y= -10/7 = -1.43

x= 2(-10/7) + 6 =-2.86 +6 = 3.14

to confirm the answer, we input the value of x and y in equation 1 and 2