Question

Use the model to solve for x.

Answer 1

Answer:

Option A

Step-by-step explanation:

Since left and right sides are equal:

$x+x+x+x+(-1) +(-1) = x+1+1+1+1\\4x-2 = 4+x\\3x=6\\x=2$

Hope that helps.

Answer 2

Answer:

          a)   x = 2

Step-by-step explanation:

On the left we have four x-es and two (-1) so: 4•x+2•(-1)

On the right we have one x and four (+1) so:  x+4•(+1)

The scarves of scales are balanced, therefore:

         4•x + 2•(-1) = x + 4•(+1)

               4x - 2  =  x + 4

                     -x        -x

                3x - 2 = 4

                    +2       +2

                   3x  =  6

                   ÷3     ÷3

                   x  =  2