Question

Select the expressions equivalent to

(−2x+8.1y)−(−9x+5.3y)
a. -11x + 2.8y
b. 7x + 13.4y
c. -11x + 13.4 y
d. 7x + 2.8y

Answer 1

d. 7x + 2.8y

Explanation:

You have to combine like factors to solve. Distribute before solving.

(-2x + 8.1y) - (-9x + 5.3y)

-2x + 8.1y + 9x - 5.3y

7x + 8.1y - 5.3y

7x + 2.8y

Answer 2

D

Explanation:

We have the expression:

`(-2x+8.1y)-(-9x+5.3y)`

First, let's distribute the negative on the right. This gives us:

`=(-2x+8.1y)+(9x-5.3y)`

Now, let's combine like terms:

`=(-2x+9x)+(8.1y-5.3y)`

Add:

`=(7x)+(8.1y-5.3y)`

Subtract:

`=(7x)+(2.8y)`

Simplify:

`=7x+2.8y`

So, our answer is D.

And we're done!