Which is the best first step when solving the following system of equations? 50+40= 10
30+ 2d=16
Multiply the first equation by -2.
Solve for d in the second equation.
O Solve for c in the first equation.
O Multiply the second equation by -2.

if Multiply the first equation by -2 solve for d in the second equation is a answer I think it's that

Step-by-step explanation:

you have to find out what d is then you - it by 2 and get your answer and then + by 30 you get your answer great. then just do 50+40 and ya

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.

c

step-by-step explanation: