Question

Which is an exponential function with a y-intercept of (0, 4)?

Help please

Answer 1

• D) y = 2ˣ + 3

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The y-intercept of (0, 4) means the function has a value of 4 when x = 0.

Verify it with given functions:

A) y = 3x + 1

• x = 0 ⇒ y = 3*0 + 1 = 1 ≠ 4, No

B) y = 4ˣ

• x = 0 ⇒ y = 4⁰ = 1 ≠ 4, No

C) y = 1ˣ

• x = 0 ⇒ y = 1⁰ = 1 ≠ 4, No

D) y = 2ˣ + 3

• x = 0 ⇒ y = 2⁰ + 3 = 1 + 3 = 4, Yes