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m = ( -3 - 7 ) : ( -3 - 2 )
m = -10 : -5
m = 2
Persamaan garis :
y = 2x - ( 4 - 7 )
y = 2x + 3
Titik potong sumbu y = a, x = 3 :
y = 2x + 3
y = 6 + 3
y = 9
Maka, nilai a = 9
-5 ( y - 7) = -10 ( x - 2)
-5y + 35 = - 10x + 20
- 5y + 10 y = 20 - 35
- 5y + 10 x = - 15------> masukkan titik c ( 3, a )
- 5(a) + 10 ( 3) = - 15
-5a + 30 = - 15
- 5a = - 15 - 30
-5a = - 45
a = 9