Enter slope m and y-intercept b for y = mx + b to instantly graph the line and see every key feature — x-intercept, direction, slope triangle, and more.
y = mx + b
m is the slope — it measures the steepness and direction of the line. A positive m means the line rises left to right; a negative m means it falls. The larger the absolute value of m, the steeper the line.
b is the y-intercept — the value of y when x = 0. It is the exact point where the line crosses the y-axis: (0, b).
Together, m and b completely determine any non-vertical line. Two lines with the same m are parallel; two lines with slopes that multiply to −1 are perpendicular.
Follow three steps to graph any line in y = mx + b form:
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