Which equation represents a proportional relationship? 1. y = 7x – 3
2. y = 150x
3. y = 21x
4. y = 2x + 1 (please put an explnation

4

Step-by-step explanation:

Let's solve for x.

2x+1=y

Step 1: Add -1 to both sides.

2x+1+−1=y+−1

2x=y−1

Step 2: Divide both sides by 2.

2x

2

=

y−1

2

x=

1

2

y+

−1

2

x=

1

2

y

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.