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cari gradien garis 4y-2x+3=0
4y - 2x + 3 = 0
4y = 2x - 3
y = 2/4 x - 3/4
y = ½x - 3/4
m = ½
gradiennya ½
jika dua garis sejajar maka gradiennya sama, maka gradiennya ½
b. yang tegak lurus dengan garis y=2/5x+4
cari gradien garis y=2/5x+4
y = 2/5 x + 4
m = 2/5
karena tegak lurus artinya m1.m2 = -1
maka
2/5 × m2 = -1
m2 = -5/2
jadi gradien garis yg tegak lurus garis y=2/5x+4 adalah -5/2
m 1= -a/b
m1 = -(-2)/ 4
m1 = 1/2
m2 = 1/2
b. m1 x m2 = -1
m1 = 2/5
m1x m2= -1
2/5 x m2 = -1
M2 = -1 : 2/5
M2 = -1 x 5/2
m2 = -5/2