Answer:

Step-by-step explanation:
Let
x------> the number of pink roses bushes
y----> the number of white rose bushes
we know that

-----> equation A

substitute the value of x in the equation A

7x+5y=-24 (1)
4x+y=42 (2)
multiply equation (2) by 5 to get
20x+5y=210 (3)
then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
-20+1= -19
-19/2= -9.5
Check:
-9.5x2= -19
-19-1= -20
In order to compare the amount of wax, you have to calculate the volume of both candles.
Candle of booth A = πr² h/3
A = π * 4² * 6/3
A = π * 16 * 2
A = 32π
Now, Candle of Booth B = π * 5² * 5/3
B = π * 25 * 5/3
B = 41.6π
In short, Booth B sells the candle with more wax.
Hope this helps!