2 years ago

Which of the following points are in the first quadrant of the xy-plabe? check all that apply

Mathematics

2 answers:

Serga [27]2 years ago

8 0

Answer: B and D because for the 1st quadrant both x and y need to be positive

Step-by-step explanation:

Readme [11.4K]2 years ago

7 0

B. (2,2)

D. (4,8)

The format for 1st quadrant is: (+,+).

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Solve the following system of equations using substitution <br> x = 4 <br> 2x + 4y = 36

DiKsa [7]

Just plug in 4 for the x

2*4 +4y =36
8+4y =36
4y =36-8
4y=28
y= 28/4
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For which values of k does the system of linear equations have zero, one, or an infinite number of solutions? [Note: not all thr

viktelen [127]

Answer:

The system has an infinite solution at k = 6, otherwise for any value of k, it has zero solution.

Step-by-step explanation:

Consider the system of linear equations:

$3x_{1} -x_{2}=2\;\;\;\;\;\;(1)\\ 9x_{1} -3x_{2}=k\;\;\;\;\;(2)$

The system of linear equations can have zero, one, or an infinite number of solutions:

simplify equation (1):

$x_{2}=3x_{1} -2$

substitute in equation (2), we get

$9x_{1} -3(3x_{1}-2)=k\\9x_{1} -9x_{1}+6=k\\0+6=k$

we cannot find the value of $x_{1}$ and $x_{2}$ .

so, there is no solution.

Multiply the equation (1) with 3 and put k is 6,

$3(3x_{1} -x_{2})=3\times2\\9x_{1} -3x_{2})=6$

it means both equations are overlapped. Then, the solution has infinite solutions.

Hence, the system has an infinite solutions at k is 6 otherwise for any value of k it has no solution.

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3 years ago

The table below shows how much Lupe earns for each mile he walks for a library fundraiser.

EastWind [94]

A. R = m + 50 ..........

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Answer:

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Step-by-step explanation:

He completed 10 out of x, or the total he has to do.

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10/x=40/100

Cross multiply to solve

40*x=100*10

40x=1000

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He must do 25 math problems

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Answer:A

Step-by-step explanation:

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