Slope-intercept form shows a line using y = mx + b. The b tells where the line starts on the y-axis, and the m shows how the line moves. For example, for y = 1x + 2, first mark the coordinate (0, 2), then travel up 1 and right 1 to (1, 3) or down 1 and left 1 to (-1, 1). Draw a line to connect the points. Now that you know what to do, help the city build quarantine barriers using linear equations to keep out the zombie pigeons.