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3 years ago

Which properties justify the steps taken to solve the system? {2+7b=0

Mathematics

1 answer:

BaLLatris [955]3 years ago

8 0

Step 1
Multiplication property of equality
Multiplying the first equation by 5 and the second equation by 7

Step 2
Addition property of equality
Adding the two equations you get 31a =217

step 3
Division property of equality
Dividing both sides of the above equation by 31 to get the value of a

step 4
Substitution property of equality
Substituting a with 7 in the first equation

step 5
Simplify
simplifying the equation got above

step 6
Using associative property of addition by taking 14 to the other side of the equation.

step 7
Division property of equality
Dividing both side of the equation by 7 to get the value of b

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lozanna [386]

Answer:

60°

Step-by-step explanation:

We'll begin by calculating EC. This can be obtained as follow:

Angle EAC = 39°

Hypothenus = EA = 3.7 m

Opposite = EC =?

Sine EAC = Opposite /Hypothenus

Sine 39 = EC / 3.7

Cross multiply

EC = 3.7 × Sine 39

EC = 2.3 m

Finally, we shall determine angle BEC. This can be obtained as follow:

Adjacent = EC = 2.3 m

Hypothenus = BC = 4.6 m

Angle BEC =?

Cos BEC = Adjacent / Hypothenus

Cos BEC = 2.3 / 4.6

Cos BEC = 0.5

Take the inverse of Cos

BEC = Cos¯¹ 0.5

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Tpy6a [65]

Answer:

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Step-by-step explanation:

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*Switch the division to multiplication and flip the 8 (or 8/1) upside-down.

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3 years ago

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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we use derivative formula $\frac{d}{dx}(x^{n}) = n x^{n-1}$

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And also apply 'u v' formula

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