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Aleonysh [2.5K]
3 years ago
15

X - (-20) = 5 _________________

Mathematics
2 answers:
tamaranim1 [39]3 years ago
8 0

X - (-20) = 5

When you subtract a negative, change it to addition:

X + 20 = 5

Subtract 20 from both sides:

X = -15

Aleksandr-060686 [28]3 years ago
3 0

Answer:

\boxed{x=-15}

Step-by-step explanation:

x-(-20)=5

\sf Distribute \ negative \ sign.

x+20=5

\sf Subtract \ 20 \ from \ both \ sides.

x+20-20=5-20

x=-15

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Step-by-step explanation:

The person pays 33$ for a membership,and then visits the museum 9 times.So 33+(9*1)=42

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A meatloaf recipe calls for 7/8 cup of bread crumbs for the loaf and the topping.If 3/4 cup is you for the loaf what fraction of
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A company rents out 15 food booths and 22 game booths at the county fair. The fee for a food booth is $100 plus $9 per day. The
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3 years ago
3x + 2y = 5 5x + 2y = 7 Based on the given system of equations, which of the following is not true? 2x = 2 8x = 12 4y = 4
weqwewe [10]
<h3>Answer:</h3>

8x = 12

<h3>Explanation:</h3>

Subtracting the first equation from the second, you get ...

... (5x +2y) -(3x +2y) = (7) -(5)

... 2x = 2 . . . . . the first answer choice is true

___

Multiplying this expression for x by 4, we get

... 8x = 8 . . . . . the second answer choice (8x=12) is false

___

Adding thee first equation to the second, you get ...

... (3x +2y) +(5x +2y) = (5) +(7)

... 8x +4y = 12

... 8 + 4y = 12 . . . . . . use the value of 8x just computed

... 4y = 4 . . . . . . . . . . subtract 8; the third answer choice is true

_____

<em>Alternate approaches</em>

In short, if you solve the system by any of the methods available, you find x=1 and y=1, so the second answer choice is clearly the correct one:

... 8x ≠ 12

By Cramer's method:

... x = (2·7-2·5)/(2·5-2·3) = 4/4 = 1

... y = (5·5-7·3)/4 = 4/4 = 1

By graphing, see attached.

By substitution (for 2y):

... 5x +(5-3x) =7 . . . . . using 2y=5-3x

... 2x = 2 . . . . . . subtract 5

... x = 1 . . . . . . . .divide by 2

... 5 -3·1 = 2y = 2 . . . . substitute x into the expression for 2y

... y = 1 . . . . . . . divide by 2

By matrix methods, see the second attachment. (x, y) = (1, 1), found in the rightmost column of the result.

6 0
3 years ago
Please help answer!!!! <br> will try and give brainliest if i can.<br> need all four answers!
Ivahew [28]

Answer:

a is option c

b is 17.5

c is 9

Step-by-step explanation:

I do not know if all of these are right

6 0
3 years ago
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