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katrin2010 [14]
3 years ago
5

Solve, using linear combination. 3x – y = 4 2x + y = 6

Mathematics
1 answer:
BlackZzzverrR [31]3 years ago
5 0
X=2
y=2
hope this helps
ps. tiger algebra is a really good website!
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The area of the rectangular faces of the box are shown . What is the volume of the box
Gnoma [55]
Label the 3 distinct sides of the box.  I arbitrarily chose the letters a, b and c.
Use the info about areas as follows:

ab=54 in^2
ac=90 in^2
bc=60 in^2

Here you have 3 equations in 3 unknowns (a, b and c), which is enough info to use to determine a, b and c.  Then the volume of the box is a*b*c.

Example:  bc = 90, but c = 60/b.  You could subst. 60/b for c in the 2nd and 3rd equation, which will eliminate c completely and leave you with 2 equations in 2 unknowns.

Continuing this procedure, I determined that a=9, b=6 and c=10.  Thus, the volume of the box is V = 9*6*10 = 540 cubic inches (answer)

3 0
3 years ago
A triangle has side lengths of 7.1, 12.6, and b. Which of the following CANNOT be b? (A) 5.7 (B) 7.5 (C) 10.1 (D) 18.5 (E) 19.9
GuDViN [60]

-- When the 7.1 and 12.6 sides both point in exactly the same direction,
their open ends are 5.5 apart.  So the missing side must be greater than 5.5 . 
All of the choices are greater than 5.5 , so we haven't found it yet.

-- When the 7.1 and 12.6 point in opposite directions, their open ends are
19.7 apart.  So the missing side can't be greater than 19.7, otherwise the
two sides we know couldn't reach between its ends.  <u>Choice 'E'</u> is greater
than 19.9, so it can't be the missing side.


8 0
3 years ago
What is 8 1/3 x 3/5?
Savatey [412]
8\frac{1}{3}\times\frac{3}{5}=\frac{8\times3+1}{\not3_1}\times\frac{\not3^1}{5}=\frac{24+1}{1}\times\frac{1}{5}=\frac{25}{1}\times\frac{1}{5}=\frac{25}{5}=\boxed5
7 0
3 years ago
The world brand of rivet placement is 11209 rivets in 9 hours and belongs to J. Mair of Ireland. If another person places 11209
Ilya [14]

Answer:

4.74 hours

Step-by-step explanation:

Given that both person have to place same number of rivets that is

11209

first person take 9 hours to complete the work

hence 1 hour work of 1st person is \frac{1}{9} of total work

second person takes 10 hours to complete the same work

hence 1 hour work of 2nd person is \frac{1}{10}

Now if both work together then

1 hour work of both person = \frac{1}{9} +\frac{1}{10} =\frac{19}{90}

thus working together they need \frac{90}{19} hours = 4.74 hours to complete the whole work which is placing 11209 rivets  

5 0
3 years ago
Factor the algebraic expression. 40a+5
Vitek1552 [10]

Answer:

5 (8a + 1)

Step-by-step explanation:

Since they both can be factored by 5 you would divide both by 5 and get 8 and 1.

7 0
3 years ago
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