MathGrade 8-10
Slope-Intercept Form of a Line Answer Key
Master the slope-intercept form y = mx + b and learn to write equations from graphs and tables.
Prior Knowledge Questions
Q1.How do you calculate slope from two points?
Answer
Slope = (y₂ - y₁) / (x₂ - x₁), also known as "rise over run".
Q2.What does a negative slope look like on a graph?
Answer
A negative slope means the line goes downward from left to right.
Q3.What is a horizontal line's slope?
Answer
A horizontal line has a slope of 0.
Activity A – Writing Equations
Q1.A line has slope 2 and y-intercept -3. Write its equation.
Answer
y = 2x - 3.
Q2.How do you find the equation of a line from a graph?
Answer
Identify the y-intercept (where line crosses y-axis) and calculate slope using two points, then write y = mx + b.
Related Gizmos
More Math gizmos coming soon.