Question

Buatlah persamaan garis lurus melalui titik (7,9) dan (11, 5)

Answer 1

x₁ = 7
x₂ = 11
y₁ = 9
y₂ = 5

Gradien :
m = ( y₂ - y₁ ) : ( x₂ - x₁ )
m = ( 5 - 9 ) : ( 11 - 7 )
m = -1

Persamaan garis :
y = mx - ( mx₁ - y₁ )
y = -x - ( -1(7) - 9 )
y = -x - ( -7 - 9 )
y = -x + 16