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MrRa [10]
2 years ago
11

Can you please solve these equations by elimination? -10x -10y=20 , -7x -7y=14.

Mathematics
1 answer:
mash [69]2 years ago
6 0

Answer:

-10x -10y=20

-10x - 20=10y

-10x - 20/10=y

-10x - 2=y

y=-10x-2

-7x -7y=14

-7x - 14 = 7y

-7x - 14/7=y

-7x - 2=y

y=-7x-2

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A half-acre building lot is five times as long as it is wide. What are its dimensions?
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we know that

A half-acre is equal to----------> 2,023.43\ m^{2}

Let

x---------> the length side of the building lot

y--------> the width side of the building lot

A------> Area of the building lot

x=5y-------> equation 1

A=2,023.43\ m^{2}

A=x*y

2,023.43=x*y --------> equation 2

substitute equation 1 in equation 2

2,023.43=[5y]*y

5y^{2}= 2,023.43\\y^{2}= 404.686\\y= 20.11\ m

<u>Find the value of x</u>

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therefore

<u>the answer is</u>

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6 0
3 years ago
What is x if the volume of<br> the box is 70 in^3 ?
kirza4 [7]

Answer:

12.25.

Step-by-step explanation:

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2) If V=70, then

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6 0
2 years ago
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2 years ago
The line is parallel to y= 2x + 1 and passes through point (-2,-1).
inessss [21]

Answer:

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Step-by-step explanation:

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2) 1 set of x and y coordinates

To find the slope:

If 2 lines are parallel, they have exactly the same gradient.

So, this line will have a slope of 2 as well (the slope of a line is the coefficient of x in the equation).

To find the equation of the line:

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<u>We know that:</u>

(x1, y1) -> (-2, -1) and m= 2

<u>So, we can substitute for the equation:</u>

y- (-1) = 2 (x -(-2))

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<u>Rearrange for y:</u>

y = 2x + 3

To double check:

1) The coefficient of x is the slope, we have 2x and the slop is 2, so that's correct

2) Sub in x= -2, and you should get y=-1

y = -4 + 3 = -1, so that's correct too

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3 years ago
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