Need 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 ?

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.

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step-by-step explanation:

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