Question

1. For the equation, x-7 = 24. can a value be substituted for x to make that a true

number sentence? How many values could be substituted for x and have a true
number sentence?

Answer 1

The value 31 can be substituted for x. Only the value 31 can be substituted.

Explanation:

So to solve a one step equation the goal is to isolate the variable. As you can tell from we are subtracting the 7. The opposite of addition is subtraction so we want to add the 7. -7 plus a positive 7 is 0 which cancels it out. Now we have x=24. However what you do to one side you need to do to the other. So we add 7 to the 24. 7+24 is 31. Therefore 31 can be substituted for x. Lets check out answer. What is 31-7? 31-7 is 24. Now we know our work was correct