Straight Line Graphs

Question 1

What is the general equation of a straight line? (not in the form y=mx+c)

Answer 1

y-y1 = m (x-x1)

Question 2

What is the formula for the gradient of a line?

Answer 2

M= y2 - y1 / x2 - x1

Question 3

What is the formula to find the length of a line?

Answer 3

√(x₂-x₁)²+(y₂-y₁)²

Question 4

What’s the formula for the midpoint of a line?

Answer 4

[(x₁+x₂)/2 , (y₁+y₂)/2]

Question 5

What are the steps to finding the perpendicular bisector of a straight line algebraically

Answer 5

1) find the midpoint of the line (these are the coordinates to get x1 and y1)
2) find the gradient
3) find the perpendicular gradient