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3 years ago

A certain high school class consists of juniors and seniors. There are

Mathematics

1 answer:

Genrish500 [490]3 years ago

8 0

Answer:

10 SENIORS

Step-by-step explanation:

x=# of seniors

y=# of juniors

x+y=23, x=2y-7

plug the value of x in the second equation into the first
(2y-7)+y=23
Remove parentheses
2y-7+y=23
Combine like terms
3y-7=23
Add 7 to BOTH sides
3y=30
divide BOTH sides by 3
3y/3=30/3
y=10
There are 10 juniors in the class

FINAL STEPS
Plug y (which is 10) into the first equation
x+y=23
x+10=23
subtract 10 from BOTH sides
x=13
Since X equals the number of seniors, there are 10 seniors in the class

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