Please hurry it’s homework

Which statement justifies why angle ebc measures 90?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.