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Ilya [14]
3 years ago
15

What is the answer to this word problem or how would I solve it

Mathematics
1 answer:
USPshnik [31]3 years ago
5 0
Its a simultaneous equation:
lets make "x" the used games and "y" the new ones

4x + 2y = 84
6x + y = 78. (multiply this by 2 to cancel out y)
12x + 2y = 156

so now we subtract them:
12x - 4x = 156 - 84
x = 9
used games cost $9
new games cost 78 - 6(9) = $24

Janet has $120 but she already bought 3 NEW games so:
120 - 3(24) = $48 left

48/9 = how many used ones she can buy = 5. something

she can buy 5 used
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Can someone ask me about this, which is algebra, please
krok68 [10]

Answer:

The correct answer is not shown in your picture. You must get a = 60.

Step-by-step explanation:

(1/2)a + (2/3)b = 50

b = 30

(1/2)a + (2/3)(30) = 50

(1/2)a + 20 = 50

(1/2)a + 20 - 20 = 50 - 20

(1/2)a = 30

2 * (1/2)a = 2 * 30

a = 60

The correct answer is not shown in your picture. You must get a = 60.

5 0
3 years ago
Given the cosine equation y = 2cos(4x) - 1, What is the midline?
pogonyaev

Answer:

y = 2 \cos(4x)  - 1 \\ when \: y = 0 \\  \cos(4x)  =  \frac{1}{2}  \\ 4x = 60 \\ x = 15 \\ when \: x = 0 \\ y = 2 - 1 = 1 \\ intercepts =  > (15, \: 0) \: and \: (0, \: 1) \\ midpoints : ( \frac{15 + 0}{2} , \:  \frac{0 + 1}{2} ) \\  = (7.5, \: 0.5) \\ gradient =  \frac{1 - 0}{0 - 15}  \\  =  -  \frac{1}{15}  \\ y = mx + c \\ at \: (7.5, \: 0.5) \\ 0.5 =  -  \frac{1}{15}  \times 7.5 + c \\ 0.5 =  - 0.5 + c \\ c = 1 \\  \therefore \: y =  -  \frac{1}{15} x + 1 \\  =  > 15y =  - x + 15

6 0
3 years ago
What is the value of X in the given right triangle? WILL GIVE BRAINLIEST!
Bas_tet [7]

Answer:

Please mark me brainliest and I hope this helped!

x = 45

Step-by-step explanation:

In this case, we can use the Pythagorean Theorem to figure out the other side of the triangle.

c squared - a squared = b squared

10 squared - 7 squared = b squared

100 - 49 = b squared

51 = b squared

7.14 = b

Now that we know the other side is about 7, we can assume that x is equal to the angle between 10 and 7. So x equals 45.

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4 years ago
How many solutions does the system 2y=10x-14 and 5x-y=7 have
Bezzdna [24]

Answer: 1 solution at (2.8, 7)

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4 years ago
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Solve 25^2x−1 = 400 for x.<br> Show your work.
Murrr4er [49]

Answer:

Exact Form:

x=401/625

Decimal Form:

x=0.6416

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3 years ago
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