NEED HELP !! Substitution method. The system of equations : y= 35 + 5x , y=100 - 8x . In how many minutes will the tanks contain the same amount of water ?

Question

asked Jan 15, 2019 56.3k views

1 Answer

Chaqke · Answer 1 · 2019-01-20T09:58:31+0000

We can substitute the expression for y from the first equation into the second equation, which just means setting the two equations to be equal:

35 + 5x = 100 - 8x

5x + 8x = 100 - 35

13 x = 65

x = 5

That's 5 minutes presumably, at which time each tank has 35+5(5)=60 units of water.