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enyata [817]
3 years ago
10

What is x+y=-20 and 6x-5y=-20 with elimination method

Mathematics
1 answer:
Lerok [7]3 years ago
4 0

Answer:

Step-by-step explanation:

x + y = -20......multiply by -6

6x - 5y = -20

-----------------

-6x - 6y = 120 (result of multiplying by -6)

6x - 5y = -20

---------------add

-11y = 100

y = -100/11 <======

x + y = -20

x + (-100/11) = -20

x - 100/11 = -20

x = -20 + 100/11

x = -220/11 + 100/11

x = - 120/11 <========

solution is : x = -100/11 and y = -120/11 or (-120/11 , -100/11)

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Woman salary is $2,800 in 1988 and was 15% more in 1989. If she paid a tax of 12.5% of her salary, how much tax did she pay in 1
iris [78.8K]

So first step is to find out how much the woman's salary is in 1989. We can do this by multiplying 0.15 (15% in decimal form) and $2,800 together, then adding that product by $2,800.

2800*0.15= \$ 420\\ 2800+420= \$ 3220

The woman makes $3,220 in 1989.

To find how much tax she pays in 1989, just multiply 0.125 (12.5% in decimal form) and 3220 together:

3220*0.125= \$ 402.50

In short, the woman paid $402.50 in tax in 1989.

5 0
4 years ago
Find the area of a sector with a central angle of 2pi/15 and a radius of 18.8 m
jolli1 [7]
We know that
[Area of a circumference]=pi*r²
for r=18.8 m
Area=pi*18.8²=1109.80 m²

if the area for 2pi radians (full circumference) is --------------> 1109.80 m²
                  for 2pi/15----------------------------------> X
X=(2pi/15)*1109.80/2pi----------> 73.99 

the answer is 73.99 m²

6 0
4 years ago
Read 2 more answers
Write a positive or negative integer that represents the situation: The temperature rises 17 degrees
Iteru [2.4K]
+17 I hope this helps
8 0
3 years ago
Idk men PLEASE HELP!
garik1379 [7]

Answer:

Let 7x be the rent paid for backhoe for seven hours.

Step-by-step explanation:

Keyword: maximum amount, the most

    Inequality symbol:  ≤

     (800 × 5) + 7x ≤ 9,000

     4,000 + 7x ≤ 9,000

     7x ≤ 9,000 - 4,000

     7x ≤ 5,000

     7x ÷ 7  ≤  5,000 ÷ 7

     x ≤ 714.29

To the nearest hundreds:

     x ≤ 700

ANSWER:  The maximum rental fee per hour  of backhoe is Php 700.00 (rounded off to the nearest hundreds).

To check if he paid less than 9,000 for the total rent:

    (800 × 5) + (700 × 7) < 9,000

    4,000 + 4,900 < 9,000

    8,900 < 9,000    (True)

7 0
3 years ago
Question 3 please after this i need my last one re did
morpeh [17]

Answer:

A

Step-by-step explanation:

4 0
3 years ago
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