Question

Which of these equations, when solved, gives a different value of x than the other three? 9.1 = -0.2x + 10 10 = 9.1 + 0.2x 10 – 0.2x = 9.1 9.1 – 10 = 0.2x

Answer 1

Answer:

d

Step-by-step explanation:

i did the test

Answer 2

1) 9.1 = -0.2x + 10         | - 10

9.1 - 10 = -0,2x + 10 - 10

-0.9 = -0.2x            | × 10

-0.9 × 10 = -0.2x × 10

-9 = -2x               | ÷ (-2)

-9 ÷ (-2) =  -2x ÷ (-2)

9/2 = x

x = 4.5

2) 10 = 9.1 + 0.2x         | - 9.1

10 - 9.1 = 9.1 + 0.2x - 0.9

0.9 = 0.2x             | × 10

0.9 × 10 = 0.2x × 10

9 = 2x              | ÷ 2

9 ÷ 2 = 2x ÷ 2

9/2 = x

x = 4.5

3) 10 - 0.2x = 9.1             | - 10

-0.2x = -0.9                | × 10

-2x = -9               | ÷ (-2)

x = 9/2

x = 4.5

4) 9.1 - 10 = 0.2x

-0.9 = 0.2x              | × 10

-9 = 2x                | ÷ 2

-9/2 = x

x = -4.5

Answer: The last one equation gives a different value of x.