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14. ungu wali = 11
ungu = 24-11 = 13
wali = 21-11 = 10
total suka ungu wali = 11 + 13 + 10 = 34
tdk suka = 37-34 = 3 (B)
15. f(-2) = 13
f(3) = -7
f(-3) = .....
= f(-2) = a(-2) + b = 13
f(3) = a(3) + b = -7 _
-5a = 20
a = -4
-2(-4) + b = 13
b = 13-8 = 5
f(-3) = -4(-3) + 5 = 17 (C)
16. m = 1 - (-2) 3
14.ungu saja=24-11=13
wali saja=21-11=10
yg tidak suka.ungu maupun wali = 37-(13+11+10)=3 orang B
15.fx=ax+b
f(-2)=-2a+b=13
f(3)=3a+b=-7
_____________________ -
-5a=20
a=-4
b=5
f(-3)=-3.-4+5=17 C
16. rumus: y-y1/y2-y1=x-x1/x2-x1
y-5/11-5=x-1/-2-1
y-5/6=x-1/-3
-3y+15=6x-6
y=(6x-21)/-3
maka gradien=m=6/-3=-2 B
17. rumus : y-y1=m(x-x1)
y+11=-4/3(x-3)
3y+33=-4x+12
3y+4x=-21C