Y varying directly with x means y equals a constant multiplying x: y=kx
in this case, k=4, so 84=4x
x=21
Answer:
Step-by-step explanation:
Find the common denominator and multiply each side by that number
<u>For bolded part in explanation</u>: 4·3=12 3·3=9
3·4=12 1·4=4