Answer:
A) x+2=y
a) x+y=12
b) 7
c) 5
Explanation:
Since x represents Alexa and Arjun (y) is 2 years older then we can represent this as
x+2=y
And the sum of their ages are 12 so we just add Alexa (x) and Arjun (y) and set it equal to 12
x+y=12
Now to find one of their ages we use substitution method
We can replace y in the second equation with what y equaled in the first equation like this
x+(x+2)=12
2x+2=12
-2. -2
2x=10
/2 /2
x =5
Now we know that Alexa is 5 so to find Arjun age we just add 2
5+2 =7
Hope this helps and lmk if you have questions