Chapter 5: Straight Line Graphs Flashcards
1
Q
What is the equation of a straight line?
A
Y= mx + c
2
Q
How do you find the gradient of a straight line?
A
Change in y / change in x
3
Q
How can you write the equation of a straight line (not y=mx+c)?
A
Ax + By + C = 0
4
Q
How else can you find the gradient of a line? (not change in y/ change in x)
A
Y-y1 = m(x-x1)
5
Q
How do you prove parallel lines?
A
If they have the same gradient
6
Q
How do you compare perpendicular lines?
A
If you multiply their gradient together and you get -1
7
Q
How do you find the gradient of a perpendicular line?
A
It’s the negative reciprocal
8
Q
How can you find the length of a line between 2 co-ordinates?
A
Distance = (square root) (x2-x1)^2 + (y2-y1)^2
