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3 years ago

3x+12=7x-18 I need the individual steps

Mathematics

2 answers:

borishaifa [10]3 years ago

7 0

3x + 12 = 7x - 18
30 = 4x
15/2 or 7.5 or 7 1/2 = x

Galina-37 [17]3 years ago

6 0

Step-by-step explanation:

*Whatever you do to one side of the equal sign you must do to the other!

Move the (coefficients?) to one side of the equal sign

2. Get rid of the constant(Notice the negative sign beside the 18. This means you add to get to 0)

3. Separate the number from the variable by dividing because 4x= 4 times x. You must do the inverse operation to get rid of the 4. (Inverse of addition is subtraction, Inverse of subtraction is addition, Divisions multiplication and multiplications division)

Since 4 doesn't go into 30 evenly, I chose to keep it as an improper fraction. If you'd prefer mixed number: 7 2/30

Sorry if it's confusing! Hope I helped! :)

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kicyunya [14]

Answer:

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Step-by-step explanation:

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3 years ago

What is the awnser to the equation r-4+6r=3+8r I'm trying to find what “r” is and if you can please solve the problem step by st

sattari [20]

Remember that you can do anything to an equation as long as you do it to both sides except divide by zero
so you can add like terms like this
you can add similar things like 1+3 and m+2m and m^2+2m^2 but not unlke things like 1+m or m+m^2

so m+2m=1m+2m=3m so

r-4+6r=3+8r
use commutative property to move numbers around (a+b=b+a)
group like terms
r+6r-4=3+8r
add like terms
1r+6r-4=3+8r
7r-4=3+8r
subtract 7r from both sides
7r-7r-4=3+8r-7r
0r-4=3+1r
-4=3+r
subtract 3 from both sides
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r=-7

7 0

3 years ago

How many solutions are there to the system of equations? 4x-5y=5 -0.08x+0.10y=0.10

SIZIF [17.4K]

First equation simplifies to
y=(4/5)x-1
The second equation simplifies to
y=(4/5)x +1
So the answer is
No Solution

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4 years ago

Expected Value (50 points)

Scilla [17]

Answer:

the expected value is if your sum is odd because half of the values you could roll are odd witch means you have 50% chance to get odd

because their are not high odds of getting something good

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3 years ago

Question 6 of 9 (3•8) • 1 = 3 • (8.1) O A. True B. False

olga nikolaevna [1]

Answer:

No, (false). The question I assume was: $(3*8)*1=3*(8.1)$

Step-by-step explanation:

1. Multiple: 3 * 8 = 24

2. Multiple: The result of step No. 1: * 1 = 24 * 1 = 24

3. Conversion a decimal number to a fraction: 8.1 = $\frac{81}{10}$ = $\frac{81}{10}$

a) Write down the decimal 8.1 divided by 1: 8.1 = $\frac{81}{1}$

b) Multiply both top and bottom by 10 for every number after the

decimal point. (For example, if there are two numbers after the decimal

point, then use 100, if there are three then use 1000, etc.)

$\frac{8.1}{1}$ = $\frac{81}{10}$

Note: $\frac{81}{10}$ is called a decimal fraction.

c) Simplify and reduce the fraction

$\frac{81}{10} = \frac{81*1}{10*1} = \frac{81}{10}$

4. Multiple: 3 * 8.1 = $\frac{3*81}{1*10}$ = $\frac{243}{10}$

Multiply both numerators and denominators. Result fraction keep to lowest

possible denominator GCD(243, 10) = 1. In the next intermediate step the

fraction result cannot be further simplified by canceling.

In words - three multiplied by eighty-one tenths = two hundred forty-three

tenths.

5. Compare: The result of step No. 2 vs The result of step No. 4: = 24 vs $\frac{243}{10}$ = $\frac{24}{1}$ vs $\frac{243}{10}$ = $\frac{24*10}{1*10}$ vs $\frac{243}{10}$ = $\frac{240}{10}$ vs $\frac{243}{10}$ = 240 vs 243 = No

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4 years ago