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GaryK [48]
3 years ago
13

Solve the system by substitution. *

Mathematics
1 answer:
baherus [9]3 years ago
6 0

Answer:

(-3,-1)

Step-by-step explanation:

Given equations are :

3x - 2y=-7\ ....(1)\\\\y=-7x - 22...(2)

Put the value of y from equation (2) to equation (1), so,

3x - 2(-7x - 22)=-7\\\\3x+14x+44=-7        

Taking variables on one side and constant on another side.    

17x=-7-44\\\\17x=-51\\\\x=-3

Put x = -3 in equation (2) i.e.

y=-7(-3) - 22\\\\y=-1

So, the value of x and y are (-3) and (-1) respectively.

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Kobotan [32]

Answer:

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Step-by-step explanation:

In order to find slope you have to follow the formula

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8 0
3 years ago
The claim is that the standard deviation of the speeds of drivers in Bradford is 8 mph. An experienced driver feels that this is
Irina-Kira [14]

Answer:

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Step-by-step explanation:

σ [Population standard deviation] = 8 , s [sample standard deviation] = s

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= 49 x (10.5)^2 / 82 = 5402.25 / 64

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P value (χ^2 49 > 84.410) = 0.00125

p = 0.0013

p < α ie 0.05

So, H0 is rejected

Hence we state that standard deviation is > 8 miles per hpur

6 0
3 years ago
What is the value of x if 6 + 7 - 9 + 4x = 12 
Lostsunrise [7]
6 + 7 - 9 + 4x = 12 \\&#10;4x=8\\&#10;x=2
5 0
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Read 2 more answers
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Step-by-step explanation:

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