The slope-intercept form of a linear equation is y = mx + b
In y = 3x - 2, the slope is 3 as it replaces m and the y-intercept is -2 as it replaces b.
A slope of 3 tells us that we go 3 units up for every 1 unit to the right. A y-intercept of -2 tells us that the line crosses the y-axis at (0, -2).
The graph is attached.