Answer:
<h3>The answer is 7/12.</h3>
Step-by-step explanation:

Solve the terms in the bracket first
That's find the LCM of the ones which are subtracting
LCM of 3 and 4 is 12
That's

Next multiply the other terms in the other bracket
That's

Add both results
That's

Find the LCM
The LCM is 12
We get the final answer as

Hope this helps you
Gained 9 yards, then lost 22:
9-22=c
-13=c
Therefore, the football team lost 13 yards in overall change in field position. Meaning, the team didn't gain any yards, they lost 13.
Solve by substitution


Just plug in y=-x-1 into y+x=3
So we get:

Simplify that:

And since that is not true, that means this system of equations has no solutions!