Which equation is an identity? a. 3(x - 1) = x + 2(x + 1) + 1
b. x - 4(x + 1) = -3(x + 1) + 1
c. 2x + 3 = 1/2 (4x + 2) +2
d. 1/3 (6x – 3) = 3(x + 1) –x2

d

step-by-step explanation:

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.