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nydimaria [60]
2 years ago
12

I need help solving

Mathematics
1 answer:
Misha Larkins [42]2 years ago
8 0
It took about 5.3 hours
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Follow the directions to solve the system of equations by elimination. 8x + 7y = 39 4x – 14y = –68 Multiply the first equation t
Helga [31]

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

7 0
3 years ago
Read 2 more answers
What will be the amount in an account with initial principal $9000 il interest is compounded continuously at an annual rate of 3
Sindrei [870]

Answer:

$11,258.30

Step-by-step explanation:

6 0
3 years ago
What is the slope of the line that passes through (-2,7) and (4, 9)? Type a numerical answer in the space provided. If
lord [1]

Answer:

1/3

Step-by-step explanation:

You need to use slope formula. (the change in Y over the change in X = Slope [x1-x2/y1-y2 = slope]). I believe you can also use point slope formula, but I forgot how to do that one.

First, you would set up the equation.

7-9/-2-4 OR 9-7/4+2

you would then solve to get

-2/-6 OR 2/6

when simplified you get

1/3

for both. Hope it helps!

6 0
3 years ago
Read 2 more answers
certain electronics manufacturer found that the marginal cost C to produce x DVD/Blu- ray players can be found using the equatio
AleksAgata [21]

Answer:

242.

Step-by-step explanation:

C = 0.03 x 2 − 8 x + 700

When the marginal cost = $522 we have:

522 = 0.03 x 2 − 8 x + 700

0.03x^2 - 8x + 700 - 522 = 0

0.03x^2 - 8x + 178 = 0

Using the quadratic formula:

x =  [ -(-8) +/- sqrt( 64 - 4 * 0.03 * 178)] / 0.06

= 8 +/- sqrt42.64 / 0.06

= 242  players.

8 0
3 years ago
Every real number is irrational true or false
katrin2010 [14]
Every real number is irrational this is true
6 0
3 years ago
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