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ziro4ka [17]
3 years ago
13

Solve the systems of equations 2x+2y+6z=8 5x+6y+5z =3 5x+6y+3z=3

Mathematics
1 answer:
vlabodo [156]3 years ago
4 0

Answer:

x=21\\y=-17\\z=0

Step-by-step explanation:

Multiply the second equation by -1:

(-1)5x+6y+5z=3(-1)\\-5x-6y-5z=-3

Add this equation and the third equation and solve for "z":

\left \{ {{-5x-6y-5z=-3} \atop {5x+6y+3z=3}} \right.\\.........................\\-2z=0\\z=0

Substitute z=0 into two original equations:

2x+2y+6(0)=8

2x+2y=8        [Equation A]

5x+6y+5(0)=3  

5x+6y=3       [Equation B]

Multiply the Equation A by -3, add both equations and then solve for "x":

\left \{ {{-6x-6y=-24} \atop {5x+6y=3}} \right.\\.....................\\-x=-21\\x=21

Substitute x=21 into the Equation A or the Equation B and solve for "y":

2(21)+2y=8\\\\42+2y=8\\\\2y=8-42\\\\2y=-34\\\\y=\frac{-34}{2}\\\\y=-17

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26.7

Step-by-step explanation:

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2 years ago
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NeTakaya

Answer:

22 square feet

Step-by-step explanation:

Area of shaded region = Area of square - Area of circle. The diameter of the circle is also the length of the side of the square as the circumference of the circle is on the circumference of the square.

Area of circle = 3.14 × r × r

r = 10 ÷ 2

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Area of circle = 3.14 × 5 × 5

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I hope this helps :)

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Find two pairs of integers whose sum is -6
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I NEED HELP REALLY BAD!
katen-ka-za [31]
<h2>Answer:</h2>

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Find the original price if the sale price of the cell phone is $205.50
Arlecino [84]

Answer:

$293.6

Step-by-step explanation:

Here is the complete question: A cell phone is on sale for 30% off. Find the original price if the sale price of the cell phone is $205.50.

Given: Sale price of cell phone is $205.50

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7 0
3 years ago
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