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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
State the formula for finding the equation of a straight line.
y - y1 = m(x - x1)
What does m stand for in the formula for a straight line?
The gradient
How do you calculate the gradient of a straight line?
change in y / change in x
If two lines are parallel, what is the relationship between the gradients?
They are the same.
If two lines are perpendicular, what is the relationship between the gradients?
They are each others’ negative reciprocals.
How can you find the distance between 2 points on a straight line?
Use Pythagoras’ theorem
When are two quantities in direct proportion?
When they increase at the same rate
What is the graph of directly proportional quantities?
A straight line through the origin
When y = kx, what does k represent?
The rate of change of y for each unit change of x
