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3 years ago

Solve the system algebraically. 2x + y - 10 = 0 x - y - 5 = 0 What is the value of y?

Mathematics

2 answers:

gogolik [260]3 years ago

8 0

Answer:

The value of y = 0

Step-by-step explanation:

The system of equations are given to be :

2x + y - 10 = 0 .........(1)

x - y - 5 = 0 ......(2)

Now, we need to solve this system of equations to find the value of y

So, Adding equations (1) and (2)

⇒ 3x - 15 = 0

⇒ 3x = 15

⇒ x = 5

Now, Putting this value of x in equation (2)

⇒ 5 - y - 5 = 0

⇒ -y = 0

⇒ y = 0

Hence, The value of y = 0

oksian1 [2.3K]3 years ago

3 0

2x+y-10=0
2x+y=10 ------------------->(1)
x-y-5=0
x-y=5------------------------>(2)
(1)+(2); 3x=15
x= 5
(x=5) substitute in (1); y=0

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One fourth of the 120 students took wood shop. How many students did not take wood shop?

yawa3891 [41]

Answer:

90 students.

Step-by-step explanation:

Given 1/4 of the 120 students took woodshop, just take the 3/4 that didn't take it:

$\frac{3}{4}(120)$

Find common factors between 4 and 120 to simplify, so 4.

$\frac{3}{1} (30)$

Now multiple across to get 90.

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3 years ago

Find the value of in the triangle shown below<br><br> 9, 7, and x around the triangle

enot [183]

Answer:

5.66 units

Step-by-step explanation:

A's per our discussion, x is a leg of right triangle.

Therefore, by Pythagoras theorem:

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3 years ago

X+y=0.5<br> x-y=1<br> elimination meathod

user100 [1]

Answer:

$x=0.75, y=-0.25$

Step-by-step explanation:

We can add the two equations to eliminate $y$ and solve for $x$ .

$x+y+x-y=0.5+1$

$2x=1.5$

$x=0.75$

Now, we can find for $y$ by using substitution:

$x+y=0.5$ (given)

$0.75+y=0.5$

$y=-0.25$

Hope this helps :)

8 0

3 years ago

Find the coordinates of the image of G(−3,9) after the translation (x,y)→(x+10,y−7) .

nataly862011 [7]

Answer:

D. (7,2)

Step-by-step explanation:

-3 +10 is 7

9-7 is 2.

kinda just put them together, you get (7, 2)

I hope this helps!

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3 years ago

You have fit a regression model with two regressors to a data set that has 20 observations. The total sum of squares is 1000 and

Llana [10]

Answer:

Hence the adjusted R-squared value for this model is 0.7205.

Step-by-step explanation:

Given n= sample size=20

Total Sum of square (SST) =1000

Model sum of square(SSR) =750

Residual Sum of Square (SSE)=250

The value of R ^2 for this model is,

R^2 = \frac{SSR}{SST}

R^2 = 750/1000 =0.75

Adjusted $R^2$ :

$Adjusted R^2 =1- \frac{(1-R^2)\times(n-1)}{(n-k-1)}$

Where k= number of regressors in the model.

$Adjusted R^2 =1-(19\times 0.25/((20-2-1)) = 0.7205$

3 0

3 years ago