what is -8x-9=-21, can someone work out the problem and show me what they did to get there answer so i can understand it?

Mathematics

2 answers:

SashulF [63]3 years ago

6 0

- 8x - 9 = - 21

Add 9 to both sides:

- 8x = - 12

Divide both sides by - 8:

x = -12/-8

x = -3/-2

x = 3/2 OR 1.5

Hope this answer helps :)

Anvisha [2.4K]3 years ago

5 0

To do this equation first:

Add 9 to both sides so you can leave -8x alone.

-8x-9+9=-21+9

-8x=-12

Divide both sides by 8:

-8x/8=-12/8

x=3/2

Answer: x=3/2

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What does 1 2/5 -3/8 equals to

fgiga [73]

8*5=40

2/5= 16/40

3/8= 15/40

1 16/40-15/40= 1 1/40

1 1/40 is the final answer.

I hope this helps!
~kaikers

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6 (x-6) = -3 (-x + 3)

Bond [772]

You have to distribute!
6(x) = 6x and 6(-6)=-36
So now you have 6x-36=-3(-x+3)
Now do the same on the other side.
-3(-x)=3x -3(3)=-9
So now, 6x-36=3x-9
Combine the like terms:
Subtract 3x in both sides.
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Now: 3x-36=-9
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3 years ago

Find f (25/29) if f (x)=-5x+5

devlian [24]

Answer:

f(25/29) = $\frac{20}{29}$

Step-by-step explanation:

In order to do this problem, we need to plug in $\frac{25}{29}$ for x. When we plug it in we get $f(x) = -5(\frac{25}{29}) + 5$ . After this we can start by multiplying. When we multiply $-5(\frac{25}{29} )$ we get $(\frac{-125}{29}) + 5$ . Since the fraction cannot be simplified any further, we can now add 5. In order to add 5 we need to find a common denominator, which in this case will be 29. Changing the denominator to 29 gives us $(\frac{-125}{29}) + \frac{145}{29}$ because when changing the denominator we have to multiply the numerator by the same number. After adding these fractions we get our answer of $\frac{20}{29}$ .