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Ganezh [65]
2 years ago
5

Writing a two column proof (edge)

Mathematics
1 answer:
frutty [35]2 years ago
8 0
It is d Ik Bc Ik don’t ask why just know it’s d
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The cost of 3 notebooks and 4 pencils is $8.50. Determine the cost of one notebook and one pencil
Assoli18 [71]
Call the notebooks x, and the pencils y. 
<span>3x + 4y = $8.50 and 5x + 8y = $14.50 </span>
<span>Then just solve as simultaneous equations: </span>
<span>3x + 4y = $8.50 </span>
<span>5x + 8y = $14.50 </span>

<span>5(3x + 4y = 8.5) </span>
<span>3(5x + 8y = 14.5) </span>

<span>15x + 20y = 42.5 </span>
<span>15x + 24y = 43.5 </span>

<span>Think: DASS (Different Add, Similar Subtract). 15x appears in both equations so subtract one equation from the other. Eassier to subtract (15x + 20y = 42.5) from (15x + 24y = 43.5) </span>

<span>(15x + 24y = 43.5) - (15x + 20y = 42.5) = (4y = 1) which means y = 0.25. </span>

<span>Then substitue into equation : </span>
<span>15x + 20y = 42.5 </span>
<span>15x + 5 + 42.5 </span>
<span>15x = 42.5 - 5 = 37.5 </span>
<span>15x = 37.5 </span>
<span>x = 2.5 </span>

<span>15x + 24y = 43.5 </span>
<span>15(2.5) + 24(0.25) </span>
<span>37.5 + 6 = 43.5 </span>

<span>So x (notebooks) are 2.5 ($2.50) each and y (pencils) are 0.25 ($0.25) each.</span>
6 0
2 years ago
Simplify completely quantity 8 x minus 16 over quantity x squared minus 13 x plus 22 and find the restrictions on the variable
hichkok12 [17]

Answer:

1

Step-by-step explanation:

6 0
3 years ago
Ella ate half of her gummy bears before adding thirteen more to the bowl. If she now has 25 gummy bears, how many did she start
vampirchik [111]

Answer:

24 gummy bears

Step-by-step explanation:

25-13= 12

12 x 2 = 24

7 0
3 years ago
Read 2 more answers
There were 323232 volunteers to donate blood. Unfortunately, nnn of the volunteers did not meet the health requirements, so they
trapecia [35]

Answer:

Concept: Application of Real world problems

  • They counted 470470470 milliliters
  • You donate on average 470 ml per person
  • So 470470470÷ 470= 1,001,001 people.

4 0
3 years ago
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Help me please!!!!!!!!
Alexxx [7]

Answer:

I'm gonna pray for you lol

Step-by-step explanation:

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