garis ax + by = -8 dan 4x - 3y = b, berpotongan di titik (-1, -3). Nilai a + b = ....

=-8

ax + by = -8 dan


a(-1)+b(-3)=-8
-a-3b=-8

4x - 3y = b 4(-1)-3(-3)=b
-4+9=b
b=5

kmbli ke prs -a-3b=-8
=-a-3b=-8
-a-3.5=-8
-a-15=-8
-a=-8+15
-a=7
a=-7

a+b=-7+5=-2