The answer to this question is line 1
Answer:
x=7
Step-by-step explanation:
make the equations equal each other
72=6x+30
subtract 30
42=6x
divide by 6
42/6=7
Factors of 21 are : 1,3,7,21....yes, this is correct...true
Substitute the first y= equation into the y of the second. Distribute as needed and solve for x. x=2 and then plug it in to find y. y=7