Which cannot be used in a proof?
a. theorems
b. postulates
c. properties
d. undefined terms

D.Undefined Terms

Step-by-step explanation:

The reason in a mathematical proof can be a given information, vocabulary definitions, properties, postulates or previously proved theorems.

But the undefined terms are the terms which used in geometry to define other terms.

Therefore , the undefined terms cannot be used in a mathematical proof .

Hence , D is the correct option.

a

step-by-step explanation:

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )