5 - Straight Line Graphs Flashcards
1
Q
What is the equation of a straight line
A
Y = mx + c
M = the gradient
C = the y intercept
2
Q
What is the equation for the gradient
A
M = ∆y / ∆x
3
Q
How do you find the equation of a straight line using the gradient and 1 point
A
Y - y1 = m(x - x1)
4
Q
How do you know if two lines are parallel
A
They have the same gradient
5
Q
How do you know if two lines are perpendicular
A
The product of their gradient is -1
Or
One has the gradient m and the other -1/m
6
Q
How do you find the distance between two points on a straight line
A
d = √(x2 -x1)² + (y2-y1)²
This is using pythagoras where the distance is the hypotenuse
