ok I have a algebra question how do you find the missing number for 42-9=43-? how do I get the answer and I need to understand it? I think the answer might be 45

42 - 9 = 33

43 - ? = 33?

ooh okay yeah that was so easy now that I look at it thank you so much..it was 10

You're welcome. :-)

10 To find the missing number in the equation 42 - 9 = 43 - ?, let's break it down step by step.

Step 1: Start by subtracting 9 from 42
42 - 9 = 33

Step 2: Now, we have an equation: 33 = 43 - ?

Step 3: To find the missing number, we need to isolate the question mark on one side of the equation. Since there is no addition or subtraction on the right side, we can directly substitute 33 back into the equation:

33 = 43 - ?

Step 4: To find the value of the question mark, we need to subtract 33 from both sides of the equation:

33 - 33 = 43 - ? - 33
0 = 43 - ?

Step 5: Now, we know that 43 minus the missing number equals 0. To find the missing number, we subtract 43 from both sides:

0 - 43 = 43 - 43 - ?
-43 = -?

Therefore, the missing number, represented by the question mark, is -43.

So, the correct answer to the equation 42 - 9 = 43 - ? is -43, not 45.