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zloy xaker [14]
3 years ago
15

Solve the following system of equations using substitution. What is the value of y?

Mathematics
1 answer:
erastova [34]3 years ago
3 0
I have no idea how did you get this result but I can show you the method of elimination. I think that it is the easiest way to solve the system of equations.
2 x + 3 y =105
x + 2 y = 6  /*(-2)      // We will multiply 2nd equation by -2. That is because                                         we want to cancel out the x`s//
2 x + 3 y = 105
-2 x - 4 y = -12        // Then we will add down these equations/ and x`s will                                          cancel out//
3 y - 4 y = 105 - 12
- y = 93
y = -93
We can also solve x:
x + 2 * (-93)=6
x - 186 = 6
x = 6 + 186
x = 192 
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Sindrei [870]

Answer:

20d + 2 = 0 \\ 20d \:   =  - 2 \\  = d =  \frac{ - 2}{20}  \\d  =  \frac{ - 1}{10}

7 0
3 years ago
Select all the factors of: 7x2 − 28 options: 7 7x (x + 2) (x − 2) (x2 + 4)
Salsk061 [2.6K]

Answer:

7(x-2)(x+2)

Step-by-step explanation:

7x^2 -28

Factor out a 7

7(x^2 -4)

The terms inside the parentheses is the difference of squares, so it is factorable  (a^2-b^2) = (a-b)(a+b)

7(x-2)(x+2)

8 0
4 years ago
Distribute (x+1)(x-2)
kirill115 [55]
(x+1)(x-2) = x(x-2) + 1(x-2)
= x.x - x . 2 + 1. x - 1 . 2
= x² - 2x + x -2
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7 0
3 years ago
Read 2 more answers
Which rectangular prism has a surface area of 62 square units? [Note: Art is not drawn to scale.]
Murljashka [212]


A rectangular prism with a length of 6, width of 2, and height of 4.
3 0
3 years ago
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2) Find x if IW = x -2 and IU = 2x - 6<br> H<br> U<br> A) 6.6<br> C) 7<br> B) 5<br> D) 4
Mrac [35]

Given:

The figure of a triangle.

IW= x-2

IU=2x-6

To find:

The value of x

Solution:

From the given figure it is clear that VI is a median of the given triangle. It means I divides UW is two equal parts.

IU=IW

2x-6=x-2

2x-x=6-2

[tex]x=4/tex]

The value of x is 4. Therefore, the correct option is D.

5 0
3 years ago
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