The difference of 2 numbers is 7. The sum of those numbers is 23. What are the 2 numbers?

Let's write this question as a systems of equations to solve.

x-y=7 (the difference)

x+y=23 (the sum)

Through the process of elimination we get

2x=30

x=15.

With that value of x, we can plug it back into any of the previous equations to get the value of y.

(15)-y=7 (Solve for y)

y=8.

The two numbers are 15 and 8.

b.-4 units

all you   do is count how many times you move

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