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3 years ago

Plz help with slope question

Mathematics

2 answers:

Gemiola [76]3 years ago

4 0

Answer:

Step-by-step explanation:

Given y=2x(Let's call this eqn1) and y=x+4(eqn2)

We can substitute eqn1 in eqn2 to get

2x=x+4

2x-x=4

x=4

Substitute the value x in eqn1

y=2x

y=2(4)

y=8

zhannawk [14.2K]3 years ago

3 0

Answer:

C. (4, 8)

Step-by-step explanation:

→Plug in y = 2x into y = x + 4, like so:

y = x + 4

2x = x + 4

→Subtract x from both sides:

x = 4

→Now plug in 4 for x into one of the equations (doesn't matter which one):

y = 2x

y = 2(4)

y = 8

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12x - 5 = 8x - x + 50 Help please show work and check the solution

Inga [223]

Answer:

x = 11

Step-by-step explanation:

$12x - 5 = 8x - x + 50 \\ 12x - 5 = 7x + 50 \\ 12x - 5 - 7x = 7x + 50 - 7x \\ 12x - 7x - 5 = 50 \\ 5x - 5 = 50 \\ 5x - 5 + 5 = 50 + 5 \\ 5x = 55 \\ x = 11$

and check:

$12(11) - 5 = 8(11) - (11) + 50 \\ 132 - 5 = 77 + 50 \\ 127 = 127$

3 0

4 years ago

Francine has a collection of 25 dolls. If 12% of the dolls are Monster High dolls, how many of the dolls are not Monster High Ex

Oksi-84 [34.3K]

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Answer:

Step-by-step explanation:

The number of Monster High dolls is ...

12% × 25 = 3 . . . dolls

The others are not Monster High dolls. Their number is ...

25 -3 = 22 . . . not Monster High dolls

4 0

3 years ago

every 1/2 mile along a hiking path there is water fountain, every 1/4 mile there is a bench, and every 1/8 mile there is a marke

defon

Bench and mile marker

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4 years ago

The perimeter of a rectangular deck is 4 times its width. If the deck's perimeter is 30 feet, what is the deck's area?

RSB [31]

Answer:

i think it is 120

Step-by-step explanation:

4 multiplied by 30 is 120

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4 years ago

What is the standard deviation of the following data set rounded to the nearest tenth? 56 ,78 ,123 , 34, 67, 91, 20

quester [9]

Answer:

The standard deviation of the following data set is 32.2

Step-by-step explanation:

step 1

Find the mean

we have

$[56,78,123,34,67,9,20]$

Sum the data and divided by the number of elements

$[56+78+123+34+67+91+20]/7=469/7=67$

step 2

For each number: subtract the Mean and square the result

$[(56-67)^{2},(78-67)^{2},(123-67)^{2},(34-67)^{2},(67-67)^{2},(91-67)^{2},(20-67)^{2}]$

$[121,121,3,136,1,089,0,576,2,209]$

step 3

Work out the mean of those squared differences

$[121+121+3,136+1,089+0+576+2,209]/7=1,036$

This value is called the "Variance"

step 4

Take the square root of the variance

$standard\ deviation=\sqrt{1,036}=32.2$

6 0

3 years ago