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3 years ago

−8x + 3y = 21 solve it

2 answers:

6 0

So first we have to subtract 3y from 21 cause the oppisit of addition which is subtraction so you get 18y when we divide that with -8y and get y=2.25y

tamaranim1 [39]3 years ago

5 0

-8x + 3y = 21
-8x + 8x + 3y = 21 + 8x
3y = 21 + 8x
3 3
y = 7 + 2 2/3x
-8x + 3(7 + 2 2/3x) = 21
-8x + 21 + 8x = 21
-8x + 8x + 21 = 21
0x + 21 = 21
0x + 21 - 21 = 21 - 21
0x = 0
0 0
x = 0
-8(0) + 3y = 21
0 + 3y = 21
3y = 21
3 3
y = 7
(x, y) = (0. 7)
-----------------------------------------------------------------------------------------------
-8x + 3y = 21
-8x + 3y - 3y = 21 - 3y
-8x = 21 - 3y
-8 -8
 x = -2 5/8 + 3/8y
-8(-2 5/8 + 3/8y) + 3y = 21
21 - 3y + 3y = 21
21 - 0y = 21
21 - 21 - 0y = 21 - 21
-0y = 0
-0 -0
 y = 0
-8x + 3(0) = 21
-8x + 0 = 21
-8x = 21
-8 -8
 x = -2 5/8
(x, y) = (-2 5/8, 0)

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pogonyaev

Answer:

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Step-by-step explanation:

the 2 points: (-2,15) and (1,9)

find the slope: 6/ -3 = -2

find y-intercept: 9 = -2 + b b=11

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iVinArrow [24]

Answer:

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Step-by-step explanation:

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3 years ago

PLEASE HELP , TRYING TO BE ON HONOR ROLL !

borishaifa [10]

Option A

The solution is $(0, \frac{-1}{4})$

Solution:

Given system of equations are:

3x + 6y = 1 ------ eqn 1

x - 4y = 1 ------ eqn 2

We have to find solution to system of equations

We can use substitution method

From eqn 2,

x = 1 + 4y -------- eqn 3

Substitute eqn 3 in eqn 1

3(1 + 4y) + 6y = 1

3 + 12y + 6y = 1

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18y = -2

Divide both sides by 18

$y = \frac{-2}{18}\\\\y = \frac{-1}{4}$

Substitute the above value of y in eqn 3

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Thus solution is $(0, \frac{-1}{4})$

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3 years ago

in an election an amount of votes was share among parties A,B and C in the ratio of 1:2:4. How many votes party B obtained if pa

spayn [35]

1000

Step-by-step explanation:

Let the share of votes obtained by the parties A, B and C be x, 2x and 4x respectively.

According to the given information:

No of votes obtained by C = 1500 + No of votes obtained by A

$\therefore 4x = 150. + x \\\\\therefore 4x - x = 1500\\\\\therefore 3x = 1500\\\\\therefore x = \frac{1500}{3} \\\\\therefore x = 500\\\\\because Votes \:obtained\: by \:B = 2x \\\\\therefore Votes \:obtained\: by \:B = 2\times 500\\\\\purple {\bold {\therefore Votes \:obtained\: by \:B = 1000}} \\\\$

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3 years ago

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coldgirl [10]

Answer:

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Then you do the 1 step equation.

Divide both sides by 6.

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I'm not sure if it's right.

5 0

3 years ago