Question

Write the equation of a line, in general form , that has an slope of zero and a y-intercept of (0, -6).

Answer 1

Use the slope-intercept form.
y = mx + b,

where m = slope and b = y-intercept.
Your y-intercept is -6, so b = -6.
The slope is zero, so m = 0

y = mx + b

y = 0x + (-6)

y = -6