Which of the following relationships is a function? a. b. y2 = 2x2 c. d. y2 = x2 – 3x + 4

(A)

we are given

we can use vertical line test

If the vertical line intersects at two points

then this is not the function

because a function can not have two outputs for same input

we get graph as

so, this is not function

(B)

we are given

we can use vertical line test

If the vertical line intersects at two points

then this is not the function

because a function can not have two outputs for same input

we get graph as

so, this is not function

2+5-(3-3)

2+5-0

7-0

7

hope this helps