You need to follow the question and plot the data. Plot weights (y) against thickness (x).
Then draw a best fit line through the points.
This line will pass through (0,c) and have a gradient m, both of which you can determine from the graph.
The equation of the line is then
y=mx+c
Substitute the values 3,5 and 7 in the equation (x values) and find the corresponding weights (y values).
Does this help?
Brick Thickness Experiment
Thickness (layers) 2 4 6 8
Breaking Weight (pennies)15 30 50 65
a. Plot the data. Draw the line for the data.
b. Find an equation for the line you drew
c. Use your equation to predict the breaking weights of paper brideges 3,5 and 7 layers thick
2 answers
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