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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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What is a simplified expression for 3(2x + y)
Brut [27]

Answer:

6x + 3y

Step-by-step explanation:

Multiply 3 by 2x.

Multiply 3 by y.

This is known as the distributive law.

4 0
3 years ago
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Pleas help me alot of points​
alekssr [168]

Answer:

12

Step-by-step explanation:

its a square all sides of the square are the same so 48 divided by 4 is 12

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6 0
3 years ago
1. 3x - 8 = 37<br><br>2. -6x + 13 = 31<br><br>3. 2 = -3x + 11<br><br>Please help me!
baherus [9]

Answer:

1 x=15

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3 0
3 years ago
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Solve the system of equations. x + 3y= -8 4x + 4y = 0​
Evgesh-ka [11]

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x = -3

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Step-by-step explanation:

6 0
3 years ago
If it’s costs 60 cents for 125 grammes. How much would 100 grammes cost?
beks73 [17]
<h3>✽ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ✽</h3>

➷ Work out the cost per gram

60/125 = 0.48

It costs 0.48 cents per gram

Multiply this by 100 to get the answer:

0.48 x 100 = 48

It would cost 48 cents

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

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