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garik1379 [7]
3 years ago
14

Solve the system of equations y=-5x x+3y=28

Mathematics
2 answers:
alex41 [277]3 years ago
8 0
(-2,10) is the correct answer
faltersainse [42]3 years ago
5 0
Use substitution
Plug in -5x for y in the second equation
x + 3(-5x) = 28
x - 15x = 28
-14x = 28, x = -2
Now plug in -2 for x in first equation
Y = -5(-2) = 10

Solution: D. (-2, 10)
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M is directly proportional to r^3
Oliga [24]

Answer:

<em>r=6</em>

Step-by-step explanation:

<u>Proportions </u>

We know M is directly proportional to r^3

This can be written as

M=kr^3

Where k is the constant of proportionality which will be determined knowing that when r = 4, M= 160. Substituting in the equation above:

160=k\cdot 4^3

160=k\cdot 64

Solving for k:

k=\frac{160}{64}=2.5

The equation is:

M=2.5\cdot r^3

Now find r when M=540:

540=2.5\cdot r^3

Dividing by 2.5:

216=r^3

Taking cube roots:

r=\sqrt[3]{216}

r=6

3 0
3 years ago
Anyone know how to do this? if so please help. I need the work to be shown
Andru [333]
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7 0
4 years ago
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Andrews [41]

Answer:

$3.50

Step-by-step explanation:

42 divided by 12 is the price of one cookie.

42 divided by 12 = $3.50

hope this helps :)

7 0
3 years ago
A store has a $43.89 item on sale. The total discount of the sale is $9.66. What is the sale percentage off on this item? 30% 32
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7 0
3 years ago
What is the answer to 3/5q=1
elena-14-01-66 [18.8K]

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6 0
4 years ago
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