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3 years ago

Solve the system of equations. 7x + 6y = -1 --x + 2y = 3

Mathematics

1 answer:

Harrizon [31]3 years ago

7 0

Answer:

X=-1

Y=1

Solve using Elimination.

Step-by-step explanation:

Multiply the second equation by 7.

The two equations are now:

7x+6y=-1

-7x +14y=21

Combine the two equations

7x and -7x cancel each other out, 14y+6y is 20y, and 21 - 1 is 20.

The equation is now

20y=20, divide 20 on both sides to get Y=1.

Now, substitute 1 as Y in the second equation for -x+2(1)=3

-x+2=3, can be simplified, by subtracting 2 from both sides. Giving us

-x=1.

Divide both sides by -1 for X=-1

Final answers being X=-1, Y=1

Hope this helps! Let me know if you have further questions!

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PLEASE HELP 9) (6 pts.) The perimeter of a rectangle is 100 feet. The length is 10 more than 3 times the width. Define variables

marin [14]

Step-by-step explanation:

sorry i am unable to understand what it is asking but if you inform me more i would love to help

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3 years ago

The length of a rectangle is 12 ft. longer than twice its width. If the total length of a width and a length is 44 ft., what is

REY [17]

Width of the rectangle is 10.67 ft

<u>Step-by-step explanation:</u>

Step 1:

Let the width of the rectangle be x. Then length = 2x + 12

Given width + length = 44ft ⇒ x + 2x + 12 = 44

⇒ 44 = 3x + 12

⇒ 32 = 3x

⇒ x = 32/3 = 10.67

Width of the rectangle = 10.67 ft

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3 years ago

Area question..........

OverLord2011 [107]

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3 years ago

Which expressions are equivalent to 4^-2 times 7^-2

Harlamova29_29 [7]

Step-by-step explanation:

$= {4}^{ - 2} \times {7}^{ - 2}$

$= {(4 \times 7)}^{ - 2}$

$= {28}^{ - 2}$

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3 years ago

Solve this question fast....in the attachment

avanturin [10]

Answer:

z = 4

y = -1

x = 2

Step-by-step explanation:

x - y = 3

Therefore => x = 3 + y

y + 2z =7

Therefore => y= 7 - 2z

We have the equation :

2x + 3y + 4z = 17

2(3 + y) + 3(7 - 2z) + 4z = 17

6 + 2y + 21 - 6z +4z = 17

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z = 4

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3 years ago