The sum of two numbers is x. If one of the numbers is 12, what is the other ?
2 answers:
If the sum of two numbers is x
Then the equation is like this:
a+b = x
Then it says one of the number is 12. Change either a or b into 12
12 + b =x
If we want to find the other number, we need the make it into the subject
b = x - 12
Hope that help.
Y would be the other unknown number.
12 + Y = X
12-12+Y=X-12
Y=X-12
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