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GalinKa [24]
3 years ago
15

Follow the directions to solve the system of equations by elimination. 8x + 7y = 39 4x – 14y = –68 Multiply the first equation t

o enable the elimination of the y-term. Add the equations to eliminate the y-terms. Solve the new equation for the x-value. Substitute the x-value back into either original equation to find the y-value. Check the solution.
Mathematics
2 answers:
Helga [31]3 years ago
7 0

Answer:

x=½

y=5

Step-by-step explanation:

(8x+7y=39)2

16x+14y=78

<u>4</u><u>x</u><u>-</u><u>1</u><u>4</u><u>y</u><u>=</u><u>-</u><u>6</u><u>8</u> add the two equations

20x=10.

divide both sides by 20

x=½

8x+7y=39

4+7y=39

7y=39-4

7y=35

y=5

MrMuchimi3 years ago
3 0

Answer:

1/2     5

Step-by-step explanation:

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It would be.703 i think hope this helps
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2 years ago
Based on a 4-week work month and a 40-hour
Leni [432]

Answer:

$27.69

Step-by-step explanation:

Given

Monthly budget (See attachment)

Month = 4\ weeks

Week = 40 \ hour

Required

Determine the closest hourly wage

From the attachment, the monthly budget is:

Budget = \$ 4430

First, we calculate the closest weekly earnings.

Since a month = 4 weeks.

Then

Weekly\ Earnings = \frac{\$4430}{4}

Weekly\ Earnings = \$1107.5

Next, we calculate the hourly earnings:

Since 1 week = 40 hour

Then

Hourly\ Earnings = \frac{\$1107.5}{40}

Hourly\ Earnings = \$27.6875

<em>From the list of options, the closest is: $27.69</em>

4 0
2 years ago
A rectangular prism has a length of 20 in a width of 2 in and a height of 3 1/4 in the prism is filled with cubes that have edge
Zinaida [17]
You can express the edge lengths in terms of "cubes" or you divide the total volume by the volume of a cube. It works either way.

Edge lengths are
.. 80 cubes by 8 cutes by 13 cubes
so total volume is
.. (80 * 8 * 13) = 8320 cubes


In cubic inches, the volume is
.. (20 in)*(2 in)*(3 1/4 in) = 130 in^3.
The volume of a 1/4-in cube is (1/4 in)^3 = 1/64 in^3.
Then the number of cubes that will fit in the prism is
.. (130 in^3)/(1/64 in^3) = 8320 . . . . cubes

8320 cubes are needed to fill the rectangular prism.
7 0
3 years ago
8, 6, 4, 2, 0, . . . Whats the value of the next sequence
kvv77 [185]

Answer:

-2, -4, -6, -8, -10......

Step-by-step explanation:

The sequence is in a decreasing order of -2 for the next sequence.

4 0
2 years ago
Read 2 more answers
A ship moves through the water at 30 miles/hour at an angle of 30° south of east. The water is moving 5 miles/hour at an angle o
iVinArrow [24]

Answer:

a. 25.98i - 15j mi/h

b. 1.71i + 4.7j mi/h

c. 27.69i -10.3j mi/h

Step-by-step explanation:

a. Identify the ship's vector

Since the ship moves through water at 30 miles per hour at an angle of 30° south of east, which is in the fourth quadrant. So, the x-component of the ship's velocity is v₁ = 30cos30° = 25.98 mi/h and the y-component of the ship's velocity is v₂ = -30sin30° = -15 mi/h

Thus the ship's velocity vector as ship moves through the water v = v₁i + v₂j = 25.98i + (-15)j = 25.98i - 15j mi/h

b. Identify the water current's vector

Also, since the water is moving at 5 miles per hour at an angle of 20° south of east, this implies that it is moving at an angle 90° - 20° = 70° east of north, which is in the first quadrant. So, the x-component of the water's velocity is v₃ = 5cos70° = 1.71 mi/h and the y-component of the water's velocity is v₄ = 5sin70° = 4.7 mi/h

Thus the ship's velocity vector v' = v₃i + v₄j = 1.71i + 4.7j mi/h

c. Identify the vector representing the ship's actual motion.

The velocity vector representing the ship's actual motion is V = velocity vector of ship as ship moves through water + velocity vector of water current.

V = v + v'

= 25.98i - 15j mi/h + 1.71i + 4.7j mi/h

= (25.98i + 1.71i + 4.7j - 15j )mi/h

= 27.68i -10.3j mi/h

7 0
3 years ago
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