Answer:
(1/4, 3)
Step-by-step explanation:
Substitution is essentially where we write one variable in terms of another, substitute that into the other equation so that we are left with 1 variable, and then solve for that variable.
Here, the second equation already shows y written in terms of x: y = 12x. Substitute this into the first equation:
6 + 8y = 30
6 + 8 * (12x) = 30
6 + 96x = 30
96x = 24
x = 24/96 = 1/4
Plug this into any of the equations to solve for y:
y = 12x
y = 12 * (1/4) = 3
The answer is (1/4, 3). *Note that none of the answer choices matches this, which means that you may have copied the answer incorrectly.*
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.4minute :
V=πr²h
V=π(1.8/2)²(3.5ft)=.9639ft³×1min/2.3ft³=.419 min
The answer is 2.22 repeated.
