Question

When graphing the following equations, which one will be a straight line?
A.
y = x2 + 2
B.
f(x) = x + 1
C.
y = |x + 4|
D.
x2 + y2 = 1

Answer 1

The answer is obvious that is option B, however for educational purposes we will graph the different cases

using a graph tool
see the attached figure

case A-------> is a parabola is not a straight line
case B-------> is a straight line
case C-------> there are two straight line
case D-------> is a circle is not a straight line
hence


the answer is the option
B.f(x) = x + 1