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KIM [24]
3 years ago
11

6x - 9= y y= -3x using the system of linear equation by substitution Help please! This is due really soon

Mathematics
1 answer:
solniwko [45]3 years ago
6 0

Answer:

x = 1 and Y = -3

Step-by-step explanation:

Rewrite equations:

y=−3x;6x−9=y

Step: Solvey=−3xfor y:

y=−3x

Step: Substitute−3xforyin6x−9=y:

6x−9=y

6x−9=−3x

6x−9+3x=−3x+3x(Add 3x to both sides)

9x−9=0

9x−9+9=0+9(Add 9 to both sides)

9x=9

9x

9

=

9

9

(Divide both sides by 9)

x=1

Step: Substitute1forxiny=−3x:

y=−3x

y=(−3)(1)

y=−3(Simplify both sides of the equation)

Answer:

x=1 and y=−3

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Steven's Diner sold 60 milkshakes last week. ​25% of the milkshakes had whipped cream on top. ​ How many milkshakes with whipped
denis-greek [22]

Answer:

the answer is 15.

Step-by-step explanation:

you find the answer by turning 25% into 0.25 then you multiple it by 60, this results in 15.

3 0
3 years ago
A real estate agent has 12 properties that she shows. She feels that there is a 30% chance of selling any one property during a
Ronch [10]

Answer:

0.2528 = 25.28% probability of selling no more than 2 properties in one week.

Step-by-step explanation:

For each property, there are only two possible outcomes. Either they are sold, or they are not. The chance of selling any one property is independent of selling another property, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

A real estate agent has 12 properties that she shows.

This means that n = 12

She feels that there is a 30% chance of selling any one property during a week.

This means that p = 0.3

Compute the probability of selling no more than 2 properties in one week.

2 or less sold, which is:

P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{12,0}.(0.3)^{0}.(0.7)^{12} = 0.0138

P(X = 1) = C_{12,1}.(0.3)^{1}.(0.7)^{11} = 0.0712

P(X = 2) = C_{12,2}.(0.3)^{2}.(0.7)^{10} = 0.1678

Then

P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0138 + 0.0712 + 0.1678 = 0.2528

0.2528 = 25.28% probability of selling no more than 2 properties in one week.

8 0
3 years ago
Lisa is 6 centimeters taller than her friend Ian. Ian is 10 centimeters taller than Jim. Every month, their heights increase by
Temka [501]

Lan is 146 centimeters tall now.

<u><em>Explanation</em></u>

Let, Lan's current height is h centimeters

As Lisa is 6 centimeters taller than Lan and Lan is 10 centimeters taller than Jim, so Lisa's current height = (h+6) centimeters and Jim's current height = (h-10) centimeters.

Every month, their heights increase by 2 centimeters.

So, after 5 months.....

Lan's height = h+(2*5)=(h+10) centimeters,

Lisa's height = (h+6)+(2*5)= (h+16) centimeters and

Jim's height = (h-10)+(2*5)= h centimeters

Given that, the sum of Ian's and Jim's heights will be 140 centimeters more than Lisa's height in 5 months. So the equation will be....

(h+10)+h= (h+16)+140\\ \\ 2h+10=h+156\\ \\ 2h-h=156-10\\ \\ h=146

So, the current height of Lan is 146 centimeters.

7 0
3 years ago
A fund-raiser at the school raises $617.50. They sent $580.45 to local charities. What percent of the money went to charities?
Flauer [41]

<u>Answer:</u>

<h2>94% of the money went to charities.</h2>

6 0
3 years ago
-4x+3 &gt;-5 Solve for a
Tresset [83]

Answer:

-4x+3>-5

or, -4x>-5-3

or, -4x>-8

or, -4x/-4<-8/-4

so, x<2

4 0
2 years ago
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