Here are two expressions with a mixing number:

An irrational number is a real number that can't be written as a fraction: since all rational numbers () are real numbers (), the irrational numbers are all elements in that don't belong to .

The rational numbers are closed with respect to sum and multiplication, which means that the sum/product of two rational numbers is a rational number.

Note that, of all the options, only is irrational, because the other options are

so they all can be written as fraction. This means that

are all rational numbers, because they are the multiplication of two rational numbers.

So, your only hope to get an irrational number is to multiply

Expression 2 works exactly in the same way, because everything we said about the product is true for the sum as well.

step-by-step explanation:

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right