3times the sum of a number n and 12 is 45

Which graph shows a function with a range of all real numbers greater than or equal to -1

The probability that a college student belongs to a health club is 0.3. the probability that a college student lives off-campus is 0.4. the probability that a college student belongs to a health club and lives off-campus is 0.12. find the probability that a college student belongs to a health club or lives off-campus. tip: p(a or b) = p(a) + p(b) - p(a and b) 0.54 0.58 0.70 0.82

How do you use the elimination method for this question? explain, because i really want to understand!