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3 years ago

How on the earth do you do this ????

Mathematics

2 answers:

Dafna1 [17]3 years ago

8 0

You basically solve one equation to get the answer to the other, which then will allow you to solve the previous equation to get your answer

julsineya [31]3 years ago

6 0

Alright, if it tells you to solve by substitution, you need to solve for either one of the variables (either x or y) in one of the equations. Let's say you solved for x. Then with the value of one of the variables (it will be an expression with y), you substitute it into the other equation in which you will get a value without variables as y. Now substitute that value y back into the first equation in which you solved for x to get the value of x.

So for 1)
5x + y = 0
y = -5x

Now plug -5x as y into the other equation -5x + y = -10
-5x -5x = -10
-10x = -10
x = 1

Now with x=1, plug that back into y=-5x.
y = -5(1)
y = -5

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Ommy Teacher wants to analyze the weights of the students at his school. He knows the weight of the students is normally distrib

marysya [2.9K]

We first determine the z-scores for the given x-values of 64 and 96.
For x = 64: z = (64 - 80) / 8 = -2
For x = 96: z = (96 - 80) / 8 = 2
Therefore we find the probability that -2 < z < 2, which is around 0.95. Therefore, out of 100 students, approximately 100(0.95) = 95 students will weigh between 64 and 96 pounds.

7 0

3 years ago

Use the distributive property to simplify this expression: 0.1(2x+3)

soldi70 [24.7K]

$\huge\text{Answer:}$

$\huge\mathrm{0.2x+0.3}\checkmark$

$\huge\text{Solution:}$

Hi there, hope you are having a great day! :)

<em /> $\bigstar\star\star\sf{What\:is\:the\:Distributive\:Property?}$

The Distributive Property is a property which states that

$\longmapsto\sf{a(b+c)=ab+ac$

Now, let's apply this property:

$\longmapsto\sf{0.1(2x+3)$

$\longmapsto\sf{0.2x+0.3}$ (Answer)

Hope you find it helpful.

Feel free to ask if you have any doubts.

$\bf{-MistySparkles^**^*$

8 0

2 years ago

Factorise fully<br>-12a - 16 <br><br>please do quick, first to answer marked brainiest!!

Allushta [10]

Answer:

-4( 3a+4)

Step-by-step explanation:

-12a - 16

-4*3a -4*4

Factor out a -4

-4( 3a+4)

3 0

3 years ago

May I please have the answers to this problem

sp2606 [1]

Answer:

6x+5

Step-by-step explanation:

2x+4x =6x

10-5=5

6x+5

6 0

3 years ago

Write three ordered pairs for direct variation relationship where y= 12 when x= 16

Kruka [31]

Ordered pairs that work for this direct variation are (4, 3), (8, 6) and (12, 9).

In order to find these, we must first find the value of the direct variation coefficient. We can do that using the base equation y = kx and then by plugging in to find k.

y = kx

12 = k(16)

3/4 = k

Now that we have k, we can model the equation as y = 3/4x. We can also find any number of ordered pairs by using the x value and finding the y value. All of the above answers work.

3 0

3 years ago