Which equation is in slope-intercept form?

• A. ax + by + c = 0
• B. y = x + b
• C. y = mx + b
• D. x = y - b

Answer: (C)

Slope-intercept form presents a line with y isolated on the left and a linear expression in x on the right: y = mx + b, where m is the slope and b is the y-intercept. This form makes it immediately clear how steep the line is and where it crosses the y-axis. The equation that matches this exact pattern is the one written as y = mx + b, using the standard symbols for slope and intercept. The other forms either don’t isolate y, or solve for x, or pick a specific slope value (like 1) instead of using the general parameter m. So the expression that aligns perfectly with the slope-intercept template is the one in the form y = mx + b.