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3 years ago

Given equations A and B as 2/5x+y=12 and 5/2y-x=6 , respectively, which expression will eliminate the variable x?

Mathematics

2 answers:

Alla [95]3 years ago

6 0

Hello,

the answer is 5/2*A+B

Fofino [41]3 years ago

3 0

Answer:

$\frac{2}{5}$ × B + A

Step-by-step explanation:

Given equations are $\frac{2}{5}$ x + y = 12 ---------(A)

and equation $\frac{5}{2}$ y - x = 6 -------------(B)

To eliminate the variable x we will multiply equation A by $\frac{5}{2}$

and add it to equation B.

In other words, the expression that we will adopt to eliminate the variable x will be $\frac{2}{5}$ × B + A

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Answer:

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3 years ago

Here's a graph of a linear function. Write the equation that describes that function. (Express it in slope-intercept form.)

rusak2 [61]

Answer:

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

Step-by-step explanation:

The equation of a linear function in a slope-intercept form is written as

$y=mx+q$

where

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q is the y-intercept

We proceed as follows. First of all, we find the y-intercept, which is the value of y at which the line touches the y-axis.

From the graph, we see that this occurs at y = 4, therefore the y-intercept is

$q=4$

Now we have to find the slope. We do that by choosing two points along the line, with coordinates $(x_1,y_1)$ and $(x_2,y_2)$ and by using the equation

$m=\frac{y_2-y_1}{x_2-x_1}$

Here we take the two points:

(0,4)

(-8,0)

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$m=\frac{4-0}{0-(-8)}=\frac{1}{2}$

Therefore, the equation of the line is

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

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3 years ago

Write three functions. In the first function, y should vary directly with x. In the second function, y should vary inversely wit

Taya2010 [7]

I dont know that either i am actually trying to figure that out now
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3 years ago

Read 2 more answers

The difference of a number N and 9 is fewer than 4

denis23 [38]

Any number less than or equal to 12

5 0

3 years ago

Substitute <br><br> -3x-8y=4<br> -2x+7y=15

Nikolay [14]

-2x=15-7y
x=-7.5+3.5y

-3x-8y=4
-3(7.5+3.5y)-8y=4
-22.5-10.5y-8y=4
-22.5-18.5y=4
-18.5y=4+22.5
-18.5y=26.5
y=-53/35

the fraction might not be in lowest terms.

3 0

3 years ago