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Valentin [98]
3 years ago
15

Which of these strategies would eliminate a variable

Mathematics
2 answers:
sdas [7]3 years ago
8 0

Answer:

Multiply the first equation by 3

Multiply the second equation by -7

Step-by-step explanation:

After doing the above method, you will derive equation 3 and 4 then you can eliminate the x and get y .

FURTHER EXPLANATION

-7x + 2y = 5 -------(1)\\3x - 5y = -5-------(2)\\\\-7x + 2y = 5 -------(1) \times 3\\3x - 5y = -5-------(2)\times-7\\\\-21x +6y=15 -----(3)\\-21x +35y=35----(4)\\Subtract -eq- 4- from -eq- 3 \\-29y =-20\\Divide-both-sides-by;-29\\\frac{-29y}{-29} =\frac{-20}{-29} \\y = 20/29\\

Substitute ; 20/29 for  y- in- eq 1\\-7x + 2y = 5----(1)\\-7x +2(20/29) = 5\\-7x +40/29=5\\-7x = 5 - 40/29\\-7x = 105/29\\Divide through by -7\\x = -15/29

I Hope It helps

katen-ka-za [31]3 years ago
7 0

Answer:

Multiply the first equation by 3

Multiply the second equation by -7

Step-by-step explanation:

( - 7x + 2y = 5) \times 3 \\ (3x - 5y =  - 5) \times 7

- 21x + 6y = 15 ..(3)\\  - 21x - 35y =  - 35...(4)

Subtract equation 3 from equation 4

- 21x - ( - 21x) =  - 21x + 21x = 0

x has been eliminated

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How to solve it and understand it
algol13

Volume of rectangle prism = w l h

Volume of rectangle pyramid = 1/3(w l h)

so Volume of rectangle pyramid = 1/3 (Volume of rectangle prism)

= 1/3 (240)

= 80

Answer:

80 cm^3

8 0
3 years ago
Which inequality is represented by the graph
castortr0y [4]
Well, accordingly to the graph, it has a positive slope so we can eliminate b and d. So it is either a or c. As x increases, so does y. Y is almost not quite equal to 3x-2. In fact, it is greater, so I'd go with A. I'm pretty confident.
8 0
2 years ago
Read 2 more answers
Could you please help solve 5.a and 5.b
Verdich [7]

Answer:

      Step-by-step explanation:

5a = 240.96

5b = 20.08

7 0
2 years ago
6
Artemon [7]

Answer:

In Martian Poker, the game is played with 8 cards drawn from a 52 card deck.

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8 0
3 years ago
Given: AB ∥ DC
RSB [31]

Answer:

A=1,720.16\ units^2

Step-by-step explanation:

we know that

The area of the trapezoid is equal to

A=\frac{1}{2}(DC+AB)DE

step 1

Find the measure of angle DAE

m∠ADC+m∠DAE=180° -----> by consecutive interior angles

we have

m∠ADC = 134°

substitute

134°+m∠DAE=180°

m∠DAE=180°-134°=46°

step 2

In the right triangle ADE

Find the length side AE

cos(∠DAE)=AE/AD

AE=cos(46\°)(40)\\AE=27.79\ units

step 3

In the right triangle ADE

Find the length side DE

sin(∠DAE)=DE/AD

DE=sin(46\°)(40)\\DE=28.77\ units

step 4

Find the area of ABCD

A=\frac{1}{2}(DC+AB)DE

we have

DC=32\ units\\AB=DC+2(AE)=32+2(27.79)=87.58\ units\\DE=28.77\ units

substitute

A=\frac{1}{2}(32+87.58)28.77

A=1,720.16\ units^2

5 0
3 years ago
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