Pure Year 1 C5

Question 1

Gradient of line with 2 points =

Answer 1

m= Y₂- y₁ / x₂ - x ₁

Question 2

Equation of straight line

Answer 2

Y=mx +c

Question 3

equation of line with gradient m that passes through point (x₁ , y₁) =

Answer 3

y-y₁ = m(x-x₁)

Question 4

Parallel lines =

Answer 4

same gradient

Question 5

Perpendicular line gradient

Answer 5

(-) 1 / m

Question 6

If two lines are perpendicular,

Answer 6

products of their gradient = -1

Question 7

You can find the distance d between (x₁, y₁) and (x₂. y₂) by using the formula

Answer 7

d=√(x₂-x₁)²+ (y₂ - y₁ )²

Question 8

Point of Intersection for two lines by..

Answer 8

using simultaneous equations