Sherry uses the steps below to solve the equation x+ (-8) = 3x+6

step 1

step 2

step 3

step 4

add 1 negative x-tile to both sides and create zero pairs

add 8 positive unit tiles to both sides and create zero pairs.

divide the 14 unit tiles evenly among the 2 x-tiles

the solution is x= 7

what is sherry's error?

See explanation

Step-by-step explanation:

Sherry has the equation

1 step: Add 1 negative x-tile to both sides and create zero pairs:

2 step: Add 8 positive unit tiles to both sides and create zero pairs:

3 step: Add 14 negative unit tiles to both sides and create zero pairs:

4 step: Divide the 14 negatuve unit tiles evenly among the 2 x-tiles:

5 step: The solution is

Or Sherry can combine step 2 and 3 and having the equation add 6 negative unit tiles to both sides and create zero products:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18