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2 years ago

Heather has to solve this system of equations using elimination. What should be her first step?

2 answers:

8 0

The elimination method is used for solving linear systems of equations.It is way of solving a linear system of equations.In the elimination method we either add or subtract the equations to get an equation in one variable.The main concept behind elimination method is to create terms with opposite coefficients because they cancel each other when added.

When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.

When Heather has to solve this system of equations using elimination her first step will be to make the coefficients of x or y the same so that one of the variable is eliminated on addition or subtraction of the equations.

charle [14.2K]2 years ago

6 0

I don’t know what the equation is but when using elimination you should cancel out opposite numbers such as 4x and negative 4x

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In a certain function, an output is 4 more than half its input.

patriot [66]

Answer:

x y

-10 -1

0 4

4 6

6 8

Step-by-step explanation:

an output is 4 more than half its input.

Input of a function is x and the output of a function is y

output y is 4 + half of input x

$y= \frac{1}{2} x + 4$

Now we complete the below table, plug in the value of x and find out y

x = -10 , $y= \frac{1}{2}(-10) + 4=-5+4 = -1$

x = 0 , $y= \frac{1}{2}(0) + 4=0+4 = 4$

x = 4 , $y= \frac{1}{2}(4) + 4=2+4 = 6$

x = 8, $y= \frac{1}{2}(8) + 4=4+4 = 8$

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3 years ago

An economist wants to predict the Gini of the US by Year. Select the answer choice that correctly interprets R-Squared. Group of

olga55 [171]

Answer:

0.451751 is the proportion of variability of Gini Coefficient explained by our least squares lines

Step-by-step explanation:

Given

$R\ squared = 0.451751$

To predict: Gini by year

Required

Interpret the R squared

In statistics, r squared measures the extent to which the variance of one variable explains the variance of the other variable.

In this question, the variable to predict is Gini:

From the list of options, (c) is correct

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2 years ago

30 girls and boys have planned for a picnic. there is a ratio of 3 girls to 7 boys how many boys are there?

adell [148]

To solve the given problem We can consider, 30% are girls of 30 people 70% are boys in 30 people In order to get the number, we just multiply the total number of people with the percentage of the designated target populace.
1. 30 x 0.3 = 9 girls 
2. 30 x 0.7 = 21 boys 
3. 21 boys + 9 girls = 30 people

Hence, there are 21 boys.

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2 years ago

Can someone help????? Pleasee!!!!!!!!!

expeople1 [14]

I think it is the second one.

8 0

2 years ago

What is the answer to the problem y-4=x

Nataly [62]

Answer:

y=x+4

Step-by-step explanation:

y-4=x

y=x+4

4 0

2 years ago

Read 2 more answers