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natka813 [3]
3 years ago
5

How many solutions does the system have?

Mathematics
1 answer:
marishachu [46]3 years ago
3 0

Answer:

{x,y} = {-2,2}

Step-by-step explanation:

Solve equation [2] for the variable  y  

 

  7y = 7x + 28

  y = x + 4

Plug this in for variable  y  in equation [1]

-8x + 4•(x +4) = 24

-4x = 8

Solve equation [1] for the variable  x  

4x = - 8  

x = - 2

By now we know this much :

   x = -2

   y = x+4

Use the  x  value to solve for  y  

   y = (-2)+4 = 2

Solution :

{x,y} = {-2,2}

and this intersects at only one point so your answer is A

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Nesterboy [21]

Answer:

The total surface area is 94ftsq

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top surface area is 12ftsq

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4 0
3 years ago
Helen paid $246 for three jeans from her favourite clothing store. How much did she pay for each jeans she bought?
Natali5045456 [20]

Answer:

estimate: $80

exact amount paid: $82

Step-by-step explanation:

If you round $246 to 240, then divide it by 3, you should get $80. The cost per pair should be around $80 each

For the exact answer you take the amount spent (246) and divide it by the amount of jeans she bought (3).

246/3 = 82

7 0
3 years ago
Technology is also known as Applied Science because it involves "using" science to make something useful for mankind.
goblinko [34]

Answer:

true

Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
What multiples to 42 and adds to -2
solniwko [45]

Answer:

Step-by-step explanation:

xy = 42

x+y = - 2                   Substitute into the top equation

y = -2 - x                   Put in for y

x(-2 - x) = 42             Remove the brackets

-2x - x^2 = 42           Subtract 42 from both sides.

-2x - x^2 - 42 = 0      Put in the more normal order.

-x^2 - 2x - 42 = 0      Multiply by -1

x^2 + 2x + 42 = 0

This cannot be factored. It gives complex roots as it is written. I will give you the answer but I kind of doubt the question is correct.

x1 = - 1 + 6.40i

x2 = -1 - 6.40i

Leave a comment if you have a correction.

4 0
3 years ago
`What is the maximum number of squares that could be formed using four of the dots in the unit grid as vertices. 5x5 grid
Dmitry_Shevchenko [17]

Answer:

my answer would be 25

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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