Assuming There is ONLY ONE CORRECT ANSWER,
The probability of her guessing the answer without ruling out the choices is 1/5.
if 3 choices are ruled out, then 1 out of the remaining two is right, which gives the probability 1/2
now, 1/5 = 20% , while 1/2 = 50%.
Therefore her probability of getting the correct answer improves by 30% [ not much in a REAL test though :P ]
Answer: B
Step-by-step explanation:

Substituting into y=3x+b,

Y=1x because if you draw it on the line you’ll see the linear variation
If it is in y it lies on 3
Answer:
5
Step-by-step explanation:
18-4(5)=-2