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tatuchka [14]
3 years ago
15

2x-4y=2 -2x+3y=0 elimination

Mathematics
2 answers:
statuscvo [17]3 years ago
8 0
2x-4y=2 \\
\underline{-2x+3y=0} \\
-4y+3y=2+0 \\
-y=2 \\
y=-2 \\ \\
2x-4y=2 \\
2x-4 \times (-2)=2 \\
2x+8=2 \\
2x=2-8 \\
2x=-6 \\
x=\frac{-6}{2} \\
x=-3 \\ \\
(x,y)=(-3,-2)
elena55 [62]3 years ago
6 0

2x-4y=2

-2x+3y=0

-------------------- (+)

3y-4y=2

-y=2   /*(-1)

<em>y=-2</em>

<em />

2x-4y=2

2x-4*(-2)=2

2x+8=2   /-8

2x=-6

<em>x=-3</em>


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I need help on this plz
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Answer:

(2) angle1 = 139, angle2 = 41, angle4 = 41, angle5 = 139, angle6 = 41, angle7 = 139, angle8 = 41

(3) angle1 = 150, angle2 = 30, angle4 = 30, angle5 = 150, angle6 = 30, angle7 = 150, angle8 = 30

Step-by-step explanation:

All angle are either equal to each other or supplementary.  I use corresponding angles and vertical angles to prove each of the above.

For number 3, angle 3 and angle 8 are supplementary, so they add up to 180:

8x +70 + (4x - 10) = 180

12x + 60 = 180

12x = 120

x = 10

So if x = 10, then 8x + 70 = 8(10) + 70 = 150

That means all angles are either 150 or 30 for number 3.

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3 years ago
Danny wants to buy a truck in 4 years. He is going to put away $2,500.00 into his savings account that will pay him 6.75% intere
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Answer:

b $3,272.43

Step-by-step explanation:

A = p(1+r/n)^nt

Where

A= future value

P= principal = $2500

r= interest rate = 6.75% = 0.0675

n = number of periods = 12

t = time = 4 years

A = p(1+r/n)^nt

= 2500(1+0.0675/12)^12*4

= 2500(1+0.005625)^48

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Approximately

A= $3272.43

He will have $3272.43 to give as down payment in 4 years

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At a football game there were 1200 spectators on Wednesday and 4.8 x 10^3 on Friday. How many times as much was the number of sp
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Step-by-step explanation:

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Solve the system using elimination.<br> 2x + 18y = -9<br> 4x + 18y = -27
Elan Coil [88]

First, let's cancel out the x by multiplying 2x + 18y = -9 by -2.

-2 ( 2x + 18y = -9) = -4x -36y = 18

Then, we combine the two equations.

-4x + 4x = 0

18y - 36y = -18y

-27 + 18 = -9

Our new equation is -18y = -9.

Now, divide both sides by -18.

-18y / -18 = y

-9/ -18 = 1/2

y = 1/2

We can plug in a value for y since y = 1/2 now.

Let's use 2x + 18y = -9

Plug in y.

2x + 18(1/2) = -9

2x + 9 = -9

Then, subtract 9 from both sides.

2x = -18

Divide by 2.

2x/2 = x

-18/2 = -9

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Lastly, we can plug in both x and y values to see it works.

2(-9) + 18(1/2) = -9

-18 + 9 = -9

Therefore, the values of x and y does work.

x = -9

y = 1/2

4 0
3 years ago
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