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4x-5=ay
(4x-5)/a=y maka m1=4/a
3x+(a+1)y=10
Y=(-3x+10)/(a+1) maka m2= -3/(a+1)
Krn kedua grs tegak lurus maka m1=-1/m2
4/a=-(-3/(a+1))
4(a+1)=3a
4a+4=3a
4=-a
a=-4
-ay=-4x+5
y=(4/a)x-5/a⇒m1=4/a
3x+(a+1)y=10
(a+1)y=-3x+10
y= (-3/a+1)x+10/a+1⇒m2=-3/a+1
saling tegak lurus
maka
m1.m2=--1
4/a.(-3)/a+1=-1
-12/a²+a=-1
-a²-a=-12
-a²-a+12=0
a²+a-12=0
(a+4)(a-3)=0
a+4=0
a=-4
a-3=0
a=3