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kari74 [83]
3 years ago
15

Which property justifies the following statement? if x=4 and y=3x-11, then 3*4-11

Mathematics
1 answer:
ser-zykov [4K]3 years ago
6 0
Substitution property
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The perimeter of a rectangle is 18cm . if the length is (x+2), find it's width.​
irga5000 [103]

Answer:

W = 7 - x

Step-by-step explanation:

The perimeter is P= 2L + 2×W , where L is the length and W is the width.

If L = (x+2) , replacing L with the expression x+2 we have

P= 2×(X+2) + 2W ⇔ 18 = 2x + 4 + 2W ⇔ 2W =18 - 2x - 4 ⇔ 2W = 14 - 2x

⇔ W = 7 - x

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3 years ago
WILL GIVE BRAINLIEST!!!!!!!
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Paralell has same slope
slope of ax+by=c is -a/b
so a paralalell line to ax+by=c is ax+by=z where a=a and b=b and z is a constant

so
paralalel to 3x-2y=-6 is 3x-2y=?
find ?
given point (4,2)
sub
3(4)-2(2)=12-4=8

equation is 3x-2y=8
solving for slope itnercept or y
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divide by -2
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B is answer
8 0
4 years ago
Thomas can mow 3 lawns in 4 hours. What is the unit rate of lawns per hour that he can mow?
Andrej [43]

Answer:

Thomas can mow 75% of lawns in 1 hour

Step-by-step explanation:

Divide 3/4 to get 0.75.

The unit rate is 0.75 to 1

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5 0
3 years ago
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If you work 11 hours per week and get paid 11.71 per hour how much do you get paid per month and per year
Delvig [45]

515 per month

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6 0
3 years ago
A person drove 36 miles per hour on a trip. If he had driven 48 miles per hour he would have arrived 4 hours earlier. What was t
nlexa [21]

Answer:

d = 576

Step-by-step explanation

Think of the two different speeds as belonging to 2 different cars going to the same place, taking the same route and going to the same place.

Let the time traveled by the fast car = t

Let the time traveled by the slower car = t+4

Let the rate of travel of the slow car = 36 mph

Let the rate of travel of the fast car = 48 mph

===========

d = 36*(t + 4)

d = 48 * t

Since the distance is the same, they can be equated.

48t = 36(t + 4)           Remove the brackets.

48t = 36t + 144          Subtract 36t from both sides.

48t - 36t = 144           Combine

12t = 144                     Divide by 12

t = 144/12

t = 12

Therefore the faster car takes 12 hours to get where it is going.

d = 48 * t

d = 48 * 12

d = 576

6 0
4 years ago
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