Mr. Pham wrote the equations below on the board 18 minus 7X equals - 20.5 what is the value of X

5.5

Step-by-step explanation

18-7x = - 20.5

-7x=-20.5-18

7x=38.5

x=38.5/7=5.5

Answer

x = 5.5

Step-by-step explanation:

Set the equation up as 18 - 7x = - 20.5

Subtract 18 from both sides of the equation. 18-18 cancels out leaving you with - 7x. - 20.5 - 18 = - 38.5.

The new equation is - 7x = - 38.5.

Divide both sides by - 7. - 7 cancels out leaving you with x and - 38.5 / - 7 = 5.5.

To check your answer plug 5.5 into the equation. 18 - 7 (5.5) = - 20.5. 7 (5.5) is 38.5. 18 - 38.5 = - 20.5