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Keith_Richards [23]
3 years ago
8

Solve the linear system of equations using the linear combination method. {8a−4b=205a−8b=62

Mathematics
1 answer:
Nata [24]3 years ago
6 0

Step 1:

Line up respective variables in column.

8a-4b=20.................(1)

5a-8b=62.................................(2)

Step 2:

We need to multiply first equation with -2 so that the coefficient of b becomes equal and opposite of -8.

8a-4b=20 *2

-16a + 8b=-40 ...................(3)

Step 3:

Add equation (2) and (3)

5a-8b=62

-16a+8b=-40

The b terms will cancel out and we are left with only a terms.

-11a = 22

dividing both sides by -11

a=-2

Step 4:

plug this value of a in equation (1) to find value of b,

8a-4b=20

8(-2)-4b=20

-16-4b=20

b=-9

Answer : a=-2 and b =-9

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Answer: 1.6km

Step-by-step explanation: 2.8km - 1.2km

The student is still north from school.

I hope this answer helped! :)

4 0
3 years ago
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Can someone explain the process getting from:
spin [16.1K]
\rm 5=e^{3b}

The unknown b is stuck in the exponent position.
We can can fix that by using logarithms.
Log is the inverse operation of the exponential.

We'll take log of each side.
Log of what base tho?

Well, the base of our exponential is e,
so we'll take log base e of each side.

\rm log_e(5)=log_e(e^{3b})

We'll apply one of our log rules next:
\rm \log(x^y)=y\cdot\log(x)

This allows us to take the exponent out of the log,

\rm log_e(5)=(3b)log_e(e)

Another thing to remember about logs:
When the base of the log matches the inside of the log,
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So our equation simplifies to this,

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As a final step, divide both sides by 3,

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k, hope that helps!


6 0
3 years ago
5.
Talja [164]

Answer:

y = -3x

Step-by-step explanation:

Given the illustration of the graph, we can see that the line is going downhill.  This would indicate that the slope is negative, so the choices would be narrowed down y = -3x or y = -x.  Looking at the line, we can use two points to find the difference in 'y' over the difference in 'x', or slope.  Using the origin (0,0) as one point, we can go down 3 and over 1 to get to the second point of (1, -3).  This would be an overall change of -3, giving us the final answer of:

y = -3x

5 0
3 years ago
Solve using any method 4x-y=20 and -2x-2y=10
dsp73

Answer:

if you're trying to find the slope, it is (3, -8) were you looking for the slope?

Step-by-step explanation:

i hope this helps, have a great day:)

7 0
2 years ago
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Hurry which one <br> A. 435<br> B. 512<br> C. 870<br> D. 1024
evablogger [386]

Answer:

Step-by-step explanation:

surface area of cuboid=2(l*b+b*h+h*l)

=2(15*15+15*7+7*15)

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8 0
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