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Linear Equations & Graphs

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Linear Equations & Graphs worksheet preview

Linear Equations & Graphs

Linear graph illustration

📊 Part 1: Plotting Linear Equations

Success Criteria: I can substitute x-values into y = mx + c and plot points accurately on a coordinate grid.

1. Complete the table for the equation y = 2x + 3, then plot the points and draw the line.

x = -2, y = _____
x = -1, y = _____
x = 0, y = _____
x = 1, y = _____
x = 2, y = _____

2. Plot the equation y = -x + 4 by finding at least 3 coordinate pairs.
3. Which statement about the gradient (m) is correct?

The gradient tells us where the line crosses the y-axis

The gradient shows how steep the line is

The gradient is always positive

The gradient only works with whole numbers

🔍 Part 2: Finding Equations from Graphs

Success Criteria: I can identify the gradient and y-intercept from a graph and write the equation in the form y = mx + c.

4. Look at the straight line graph provided. Calculate the gradient using "rise over run" and identify the y-intercept.

Gradient (m) = rise ÷ run = _____ ÷ _____ = _____
Y-intercept (c) = _____
Equation: y = _____ x + _____

5. A line passes through points (0, 5) and (2, 9). Find the equation of this line.

Step 1: Find the gradient: m = _____
Step 2: Identify the y-intercept: c = _____
Step 3: Write the equation: y = _____

6. Match each equation to its correct description:

y = 3x + 2

Gradient of -1, y-intercept of 7

y = -x + 7

Gradient of 3, y-intercept of 2

y = 0.5x - 1

Gradient of 0.5, y-intercept of -1

🚀 Part 3: Extension & Real-World Applications

For Advanced Learners: Explore special cases and applications of linear equations.

7. What happens when the gradient is zero? Draw an example and explain.
8. A taxi company charges $3.50 to start the trip plus $2.20 per kilometre travelled.

a) Write this as a linear equation where y = total cost and x = kilometres: y = _____________

b) What does the gradient represent? _________________________________

c) What does the y-intercept represent? _____________________________

9. Challenge: Two lines are parallel if they have the same ___________ but different ___________.

Write an equation that would be parallel to y = 4x + 1: y = _____________

10. Reflection: Explain in your own words how to find the equation of a straight line from its graph.

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