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user100 [1]
3 years ago
5

What is the simplified expression for the expression below? -1/5(5x+20)-1/4(4x-28)

Mathematics
2 answers:
e-lub [12.9K]3 years ago
7 0

You need to distribute the numerical factors for each term in the parenthesis:

\dfrac{-1}{5}(5x+20)-\dfrac{1}{4}(4x-28) = \dfrac{-1}{5}\cdot 5x + \dfrac{-1}{5}\cdot 20 + \dfrac{-1}{4} \cdot 4x + \dfrac{-1}{4} \cdot (-28)

This equals

-x-4-x+7 = -2x+3

WITCHER [35]3 years ago
5 0

Answer:

-2x+3

Step-by-step explanation:

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I WILL MARK YOU BRAINLYEST if you answer all of my problems !!!!!!!!!!!
Romashka [77]

First, let's convert each line to slope-intercept form to better see the slopes.

Isolate the y variable for each equation.

2x + 6y = -12

Subtract 2x from both sides.

6y = -12 - 2x

Divide both sides by 6.

y = -2 - 1/3x

Rearrange.

y = -1/3x - 2


Line b:

2y = 3x - 10

Divide both sides by 2.

y = 1.5x - 5


Line c:

3x - 2y = -4

Add 2y to both sides.

3x = -4 + 2y

Add 4 to both sides.

2y = 3x + 4

Divide both sides by 2.

y = 1.5x + 2


Now, let's compare our new equations:

Line a: y = -1/3x - 2

Line b: y = 1.5x - 5

Line c: y = 1.5x + 2

Now, the rule for parallel and perpendicular lines is as follows:

For two lines to be parallel, they must have equal slopes.

For two lines to be perpendicular, one must have the negative reciprocal of the other.

In this case, line b and c are parallel, and they have the same slope, but different y-intercepts.

However, none of the lines are perpendicular, as -1/3x is not the negative reciprocal of 1.5x, or 3/2x.

<h3><u>B and C are parallel, no perpendicular lines.</u></h3>
8 0
3 years ago
Evaluate the following expression when x=3.<br><br> 2x+7
xxMikexx [17]

Answer:13

Step-by-step explanation:

2 times 3 is 6 so then we add 7 to get 13

6 0
4 years ago
Which is equivalent to the expression below? 6x + 2x + y + 3y​
lozanna [386]

Answer:

8x + 4y

Step-by-step explanation:

6x + 2x + y + 3y

Combine like terms

(6x + 2x) + (y + 3y)

8x + 4y

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3 years ago
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3 years ago
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Answer:

trey

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