#5 Straight Line Graphs

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10 Terms

1
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What are the two main ways to write the equation of a straight line?

y = mx + c

ax + by + c = 0

2
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State the formula for finding the equation of a straight line.

y - y1 = m(x - x1)

3
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What does m stand for in the formula for a straight line?

The gradient

4
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How do you calculate the gradient of a straight line?

change in y / change in x

5
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If two lines are parallel, what is the relationship between the gradients?

They are the same.

6
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If two lines are perpendicular, what is the relationship between the gradients?

They are each others’ negative reciprocals.

7
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How can you find the distance between 2 points on a straight line?

Use Pythagoras’ theorem

8
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When are two quantities in direct proportion?

When they increase at the same rate

9
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What is the graph of directly proportional quantities?

A straight line through the origin

10
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When y = kx, what does k represent?

The rate of change of y for each unit change of x