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Veseljchak [2.6K]
3 years ago
14

Solve the system of equations. -x - 3y = 20 -x + 4y = -36

Mathematics
1 answer:
zhuklara [117]3 years ago
8 0
Multiply the second equation by 1 to make it positive then add them together.
-x-3y=20
+x-4y=36
----------------
-7y=56
y=-8

Plug that into one of the equations above.
-x-3(-8)=20
-x+24=20
-x=20-24
-x=-4
x=4

So x=4 y=-8 or (4,-8)

Hope that helps

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20 points if you can answer this! :D​
andrew-mc [135]

Answer:

The answer is Ari, Beth, Cindy

Explanation

Ari

  • 2¾ miles is 2.75 miles
  • speed of 2½ miles per hour is 2.5 mi/h

DISTANCE = SPEED × TIME

t = d/s

= 2.75/2.5

= 1.1hr

= 66mins

Beth

  • 1¾ miles is 1.75 miles
  • speed of 1¼ miles per hour is 1.25 mi/h

t = d/s

= 1.75/1.25

=1.4hr

=84mins

Cindy

  • 1hr 21mins is 81mins

(Correct me if i am wrong)

5 0
3 years ago
Show your work!!!!!!!!!!!!!!!!!!!!!!!
elena-14-01-66 [18.8K]

Answer:

Here is my workk

Step-by-step explanation:

WORKKKKK

5 0
3 years ago
Bridget was thinking of a number. Bridget doubles it, then adds 15 to get an answer of 16.4. What was the original number?
lyudmila [28]
0.7 is the correct number:)
6 0
3 years ago
Read 2 more answers
How does a change in demand relate to a demand curve
marissa [1.9K]
A change in any one of the underlying factors that determine what quantity people are willing to buy at a given price will cause a shift in demand. Graphically, the new demand curve lies either to the right (an increase) or to the left (a decrease) of the original demand curve.
7 0
3 years ago
Point T is located at (6, –2) and point S is located at (1, 13). What are the coordinates of the point that is 4/5 of the way fr
Darya [45]

Answer:

(2, 10)

Step-by-step explanation:

Making the points on a graph and creating a line between them, you can see the equation to connect the two points is -3x + 16. Then, because the points are 5 units apart horizontally, go to the point that is 4 units left of point T (1/4 of the way between T and S) and that is your point: (2, 10)

I apologize if this is incorrect :)

7 0
3 years ago
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