Domain (x, input, and independent variable are other names.)
Determine how far above and below 0 the line graphed goes on the x-axis. Since it can go infinitely above and below 0, the domain = -∞ ≤ x ≤ ∞ = ∞
Range (y, output, and dependent variable are other names.)
Determine how far above and below 0 the line graphed goes on the y-axis. Since it can only go to +2 above 0 and infinitely below 0, the range = -∞ ≤ y ≤ 2
