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zheka24 [161]
3 years ago
8

Solve the following system of equations. Show your work -3-3y=12x , -5-y=2x

Mathematics
1 answer:
tekilochka [14]3 years ago
4 0

solving simultaneously

let equation 1 be -3-3y=12x

let equation 2 be -5-y=2x

equation 2 make y subject of formula=> y=-5-2x

replace (y=-5-2x) in equation 1

-3-3(-5-2x)=12x

solve for x

x=2

replace x=2 in equation 2

y=-5-2(2)

y=-9

Therefore, x=2 y=-9

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if 16 men can finish to contruct a bulding in 40 days how manny more men are needed to finish the contruction in 32 days​
Digiron [165]

Answer:

20 mens are needed to contruct a building in 32 days.

5 0
3 years ago
The area of a rectangular wall of a barn is 252 square feet. Its length is 10 feet longer than twice its width. Find the length
valentinak56 [21]

Answer: Length = 28 feet and width = 9 feet

Step-by-step explanation:

Let x = width of the wall.

Then, Length of the wall =  10+2x

Since , Area of rectangle = length x width

Then, as per given,

252= (10+2x)x\\\\\Rightarrow\ 252=10x+2x^2\\\\\Rightarrow\ 2x^2+10x-252=0\\\\\Rightarrow\ x^2+5x-126=0\\\\\Rightarrow\ x^2+14x-9x-126=0\\\\\Rightarrow\ (x+14)-9(x+14)=0\\\\\Rightarrow\ (x+14)(x-9)=0\\\\\Rightarrow\ x=-14 \ or \ x= 9

Since width cannot be negative , so x = 9

So width = 9 feet and length = 10+2(9)=10+18 = 28 feet

Hence, length is 28 feet and width is 9 feet of the wall of the barn.

7 0
4 years ago
Which of the following is the graph of the equation y=3x^2-4x-2
I am Lyosha [343]

Answer:

stop

Step-by-step explanation:

(of an event, action, or process) come to an end; cease to happen.

example "his laughter stopped as quickly as it had begun"

3 0
3 years ago
Elliot and Katy both bought the same lunchbox for $6. Elliot lives in Oklahoma and pays 4.5% in sales tax, while Katy lives in S
olasank [31]
The answer is <span>A.$0.09!

</span>
3 0
4 years ago
Read 2 more answers
2{ 5[12+5 (500 - 100)+399]}
notsponge [240]

This is solved by breaking the equasion down.

2 { 5 [12 + 5 (500 - 100) + 399 ]}

2 { 5 [12 + 5 (400) + 399]}

2 { 5 [12 + 2000 + 399]}

2 { 5 [2411]}

2 {12055}

24110

Is this the answer you were looking for?

3 0
4 years ago
Read 2 more answers
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