Which solution method, graphing, substitution, or elimination, is the most appropriate for solving each system of equations? Explain. Will mark brainlist!!!

1st Question

3x + 8y = -4

2x - 4y = 16

2nd Question

6x - y = 16

x = 4y - 5

3rd Question

x + y = 19

3x - 2y = -3

"you know, playing tennis is healthier than watching a tennis match on television," katya remarked to her couch potato brother. in this sentence, healthier is a/an a. superlative. b. comparative. c. positive form. d. adverb.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.