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sdas [7]
2 years ago
13

-x + 1 = x + 21solve for xI need this asap​

Mathematics
2 answers:
bezimeni [28]2 years ago
8 0

Answer:

x = -10

Step-by-step explanation:

-x + 1 = x + 21

(given)

__________

-x + 1 = x + 21

+x +x

(addition property of equality)

(add the x term on both sides to cancel out -x)

__________

1 = 2x + 21

-21 -21

(subtraction property of equality)

(subtract by 21 on both sides to get rid of the constant term on the x side)

________

-20 = 2x

÷2 ÷2

(division property of equality)

(divide to get rid of the coefficient of 2 in the x term)

_______

-10 = x

(symmetric property of equality)

(switch both sides so that x is on the left)

_______

x = -10

________________________________

Proof by substitution:

x = -10 because

x = -10 → -x + 1 = x + 21 → -(x) + 1 = (x) + 21 → -(-10) + 1 = (-10) + 21 → 10 + 1 = 21 - 10 →

11 = 11

levacccp [35]2 years ago
3 0

Answer:

x=10

Step-by-step explanation:

Put both of the x on one side, and the numbers on the other side (this breaks down the equation).

This is make it easier for you to add/substract/divide/multiply.

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Yousef buys 40 tokens at the carnival. He gives his sister tokens for 5 kiddie rides. He wants to use the remaining token for th
lawyer [7]

Answer:

5 rides

Step-by-step explanation: Multiply the number of kiddie rides his sister will go on (5) by the amount of tickets it costs each (3). subract that from 40 (the initial amount of tickets). then divide that by 5 (amount of tickets for  1 thrill ride)

3 0
2 years ago
What is the property of this equation? if 2x=8 then x=4
Eva8 [605]
Answer is 2 x 4=8 this is a scientific property
7 0
2 years ago
Which measurement is most accurate to describe the width of a penny?
klasskru [66]

Answer:

19 mm

Step-by-step explanation:

A penny is not that large, and you can fit multiple pennies in the palm of your hand. This means that the only reasonable measurement is 19 mm, (& 8 cm, but that is only if you have really large hands). Therefore, (A) is your choice.

~

8 0
3 years ago
Can someone please help me I'm confused as to what I'm supposed to do.
kobusy [5.1K]
I hope this helps you


(fog)(5)=f (g (5))=?



x= 5 g (5)=-4.5+3=-20+3=-17




f (g(5))=f (-17)=-2. (-17)-7




f (-17)=34-7




f (-17)=27
4 0
2 years ago
A wise man once said” 200 reduced by twice my Age is 42.” What is his age ?
kati45 [8]
200 - (2x) = 42

200 - 42 = 2x

158/2 = 2x/2

x = 79

he is 79 years old

hope this helps

a wise 'old' man
3 0
3 years ago
Read 2 more answers
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