The sum of 2 numbers is 26. The difference is 42.

if you are trying to find the two numbers than you need to make equations.

Let the bigger number by x
Then the smaller number by y.

We know: The sum of 2 numbers is 26

So that means: x + y = 26

The difference between them is 42.

So this means: x - y = 42

Which means you have the system:
x - y = 42
x + y = 26

Solve for x and y with the method you've learned.
 
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