Start by choosing the feature you want to read from a graph.
Plot a line from slope and intercept
In y=2x+1, the intercept is (0,1). The slope is 2, so the next point is (1,3).
Find the roots of a quadratic
For y=x²−4, the graph crosses the x-axis at x=−2 and x=2. Substitution confirms both zeros.
Check domain and range
For y=√x, real outputs start at x=0. Both the domain and range are [0,∞).