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3 years ago

7

Can someone please help me!!!

2 answers:

kati45 [8]3 years ago

6 0

Answer: To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by 5. The solution to system B will be the same as the solution to system A.

Step-by-step explanation:

egoroff_w [7]3 years ago

5 0

The correct answer is the first one(a): To get the system B,..., the first equation multiplied by 4...

Explanation:

1. Let us first multiple the first equation in System A with 4, we would get:
4(2x - y) = 4 * 3

=> 8x - 4y = 12 --- (A)

Now add the equation (A) and the second equation of System A:

8x - 4y = 12
3x + 4y = 10
------------------
11x = 22

Hence,
System B:
2x - y = 3
11x = 22

-i

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How many solutions does the system have? y=−2x−4 y=3x+3

Molodets [167]

Answer:

One Solution

Step-by-step explanation:

First substitute the y in the first equation with the second equation to get

-2x-4=3x+3

since theres a variable of both sides, you subtract the variable with the least coefficient, in this case, you add 2x to both sides to get

-4=5x+3

subtract the constant on both sides to get

-1=5x

divide both sides by 5

x= -0.2 or -1/5

4 0

3 years ago

Read 2 more answers

Given the equation y − 3 = one half (x + 6) in point-slope form, identify the equation of the same line in standard form. (1 poi

Alex17521 [72]

Answer:

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Step-by-step explanation:

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4 0

3 years ago

What is the value of x in the solution to this system of equations?<br> y = x + 1<br> y = 5x + 13

barxatty [35]

Step-by-step explanation:

y=x+1

y=5x+13

=13x/1

=5x/x

5 0

3 years ago

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Ahat [919]

The green dot is(6,2)

3 0

3 years ago

Brittany uses the rowing machine and the stair machine at the gym for an exercise program. Her trainer wants her on an exercise

dangina [55]

Answer:

The equations are: $x+ y = 30$ and $x = 3y$ .

Step-by-step explanation:

We are given that Brittany uses the rowing machine and the stair machine at the gym for an exercise program.

Let the time spend by Brittany on the stair machine be represented by the variable $x$ .

and the time spend by Brittany on the rowing machine be represented by the variable $y$ .

Now, there are two conditions stated by her trainer;

The first condition states that Brittany will exercise for 30 minutes, dividing her time between the two types of machines, that is;

$x + y = 30 \text{ minutes}$

The second condition states that Brittany will spend three times as much time on the stair machine as on the rowing machine, that is;

$x = 3y$

So, the equations are: $x+ y = 30$ and $x = 3y$ .

These equations can be solved either using the substitution method or the elimination method.

6 0

3 years ago