3 years ago

6z + 3 -4z = 9 help please (7th grade)

Mathematics

2 answers:

Ede4ka [16]3 years ago

8 0

the answer is z=3. hope this helps

Sonja [21]3 years ago

6 0

First you combine like terms together:

6z + 3 -4z =9

(6-4=2)

Now put everything back in its place:

2z + 3= 9

To get the variable (z) by itself, you have to subtract 3 from both sides of the equal sign:

2z + 3 = 9

-3 -3

Now it should be:

2z = 6

Then the final step is to divide by 2 on both sides of the equal sign.

2z = 6

2 2

Your final answer after this should be:

z = 3

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4 years ago

This rational expression is nonequivalent. 5x / 25x^4 ; x^3 / 5x^15 True or false?????

FromTheMoon [43]

It is nonequivalent. Figure it out this way. Think about what number has to be multiplied by both the numerator and the denominator of $\frac{5x}{25x^4}$ to get to $\frac{x^3}{5x^15}$ . It has to be the samee number for the one expression to be equivalent to the other. To get from 5x to x^3, we have to multiply by 1/5x^2. When we do that we get x^3. Good. Now we have to multiply the denominator by the same thing, 1/5x^2. $25x^4(\frac{1}{5}x^2)=5x^6$ . As you can see, they are not equivalent.