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yanalaym [24]
2 years ago
8

What is the solution to the system? 5x-y+z=4 x+2y-z=5 2x+3y-3z=5

Mathematics
1 answer:
aev [14]2 years ago
6 0
Eliminate one variable at a time.  We have three equations so we can solve for three variables.

(5x-y+z=4)-5(x+2y-z=5)=-11y+6z=-21

-2(x+2y-z=5)+(2x+3y-3z=5)=-y-z=-5

Now using the two yz equations above to cancel out z

(-11y+6z=-21)+6(-y-z=-5)=-17y=-51

-17y=-51  divide both sides by -17

y=3, making -y-z=-5 become:

-3-z=-5, z=2, making <span>5x-y+z=4 become:

5x-3+2=4

5x-1=4

5x=5

x=1

So the solution to the system of equations, (x,y,z) is (1,3,2)</span>
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Nick does not has enough money to follow this recommendation.

Step-by-step explanation:

Given: A self-service car wash charges $4 for the initial 5 minutes plus an additional $0.75 for each minute after that.

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Also, A car enthusiast magazine recommends spending at least 15 minutes to properly wash a car.

For m\geq15

\\\Rightarrow\ y=4+0.75(m-5)\geq4+0.75(15-5)\\\Rightarrow\ y\geq4+0.75(10)\\\Rightarrow\ y\geq4+7.5\\\Rightarrow\ y\geq11.5

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7 0
3 years ago
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Answer:

$4,711.31

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