Garden garis persamaan 10y – 5x – 15 = 0

10y – 5x – 15 = 0
10y = 5x + 15
y = 1/2 x + 3/2
gradiennya adalah 1/2

10y – 5x – 15=0
-5x + 10y – 15 = 0
ax+by+c=0, a=-5,b=10
m = -a/b = -(-5)/10 =5/10 = ½