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ValentinkaMS [17]
4 years ago
9

PLEASE help!! I need help with this quick!!!! I partly know how to do this, but not 100%. Use the linear combination method to s

olve the system of equations. Explain each step of your solution.
2x - 3y = 13
x + 2y = -4
Your step by step will help me get this down.
Mathematics
1 answer:
ira [324]4 years ago
5 0
Add the equations in order to solve for the first variable. PLug this value into the other equations in order to solve for the remaining variables.
The answer is:
(2, -3)
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In 1995, a public library had 16,000 books on its shelves. In 1999 the library had 19,000 books. Find the average rate of change
marusya05 [52]

Answer:

<u><em>750 Books Per Year</em></u>

Step-by-step explanation:

For this problem, we will be using the standard Rate Of Change formula that we use for graphs:

<em>RoC = (y2 - y1) / (x2 - x1)</em>

y = books

x = year

By plugging in the given values:

RoC = (19000 - 16000) / (1999 -1995)

RoC = 3000 / 4

<u>RoC = 750</u>

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8 0
3 years ago
10(1 – 2y) = -5(2Y - 1)
mars1129 [50]

Answer:

y =1/2

Step-by-step explanation:

solve for ; y

10(1 – 2y) = -5(2Y - 1)

-10(2y-1) +5(2Y - 1) =0

(2y-1)(-10+5) = 0

-5(2y-1) =0

2y-1=0

y = 1/2

7 0
3 years ago
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HELP ME WITH THIS IT IS REALLY HARD
SSSSS [86.1K]

Answer:

-2 1/8

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8 0
4 years ago
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a certain number of yams is sufficient to feed 20 students for 12 days for how many days would the same number of yams feed 15 s
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Step-by-step explanation:

no of days = (15×12)/20= 9 days

I hope this helps

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3 years ago
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