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Alchen [17]
3 years ago
13

What is the solution to X and Y in these equations 3x + 9y=60 and -3x + y=30

Mathematics
1 answer:
Roman55 [17]3 years ago
8 0

Answer:

x= -7 y=9

Step-by-step explanation:

3x +9y= 60 [1]

-3x +y=30 [2] rewrite this as the following:  y=30+3x

With equation [2] you substitute it into equation [1]

so it will now be: 3x+ 9(30 +3x) =60

3x+270 +27x=60

Group the like terms

3x+27x=60-270

30x=-210

x=-7

Use this answer into the same equation

So: 3(-7)+9y=60

-21 +9y=60

9y=60+21

9y=81

y=9

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X + 3/2= 2 1/4 whats the answer
kicyunya [14]

Move all terms not containing x to the right side of the equation.

Exact Form:

x=15/4

Decimal Form:

x=3.75

Mixed Number Form:

x=3 3/4

hope this helps

5 0
2 years ago
Three consecutive integers whose sum is -147
suter [353]

Step-by-step explanation:

Let the first integer be x

2nd integer = x + 1

3rd integer = x + 2

x + x + 1 + x + 2 = -147

3x + 3 = -147

3x = -147 - 3

3x = -150

x = -150 ÷ 3

x = -50

The three consecutive integers are

-50, -49, -48

5 0
4 years ago
Compute the requested value. Choose the correct answer.
Fiesta28 [93]

Original price of the item = $14.95

Price after discount = $13.79

Discount offered = original price - price after discount = 14.95- 13.79 = $1.16

Now let us find the percentage of discount offered.

Percentage discount is given by the formula:

Percentage discount = \frac{MP-SP}{MP}*100

Where MP= Marked price= original price

SP= selling price= price after discount

Percentage discount = \frac{1.16}{14.95}*100

Percentage discount = 7.759 %

7 0
3 years ago
Read 2 more answers
Math problem+Zoey, a Gelada Baboon, is tied to one of the outside corners of a regular hexagon-shaped research facility, where h
dexar [7]

Answer

The monkey will be able to cover an area of 22.86 meters which is equivalent to two sides and half of the building.

Step-by-step explanation:

The length of the monkeys rope = 75 feet long

Each side of the hexagon shaped facility = 30 feet

Note that, 1 feet = 0.3048 m

if we convert 30 feet to Meter, we have,

30 × 0.3048 = 9.144

Therefore, 30 + 30 +15 = 75 which is equivalent to the two side and half side of the hexagon shaped building

75 feet × 0.304 meter = 22.86 meters.

So the total area the monkey will be able to cover will be

= 22.86 Meters which is equivalent to two sides and half of the hexagon shape building.

8 0
3 years ago
Need help on the last question
Ray Of Light [21]

Answer: no thank you

Step-by-step explanation:

For 5 free points

7 0
3 years ago
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