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

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

She should use 12/3 to measure