Asked by Lilian

How do you solve this problem?

3x = 4y
x + y = 21

Help please.
Answered by drwls
Substitute 21 -x for y in the first equation.
3x = 4(21-x)
7x = 84
x = 12
y = 21-x = 9
There are no AI answers yet. The ability to request AI answers is coming soon!