Which systems of equations have enough variables and equations to potentially solve the system? Select all that apply.

1) {3x−4=y
−5x+7=y

2) {3x−4y=8z
−3x+6y=4z

3) {2x−4y=8
−2x+6y=14

4) {y=2x−4
y=−9z+6

5) {y=2x−4
y=−x+6

please get me to 10points and thank you! :)

70

step-by-step explanation:

k

step-by-step explanation:

domit

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.