Consider the following system of equations:
equation 1: 82 + 2y = 30
equation 2: 70 + 2y = 24
which variable pair should we try to eliminate?
the x's because the coefficients are the same.
the y's because the coefficients are the same.
the x's because the coefficients are different?
the y's because the coefficients are different?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Mickey needs to cut pieces of ribbon that are each 1 meter long tie onto balloons. if he has 8 pieces of ribbon that are each 1 dekameter long. how many 1 meter pieces of ribbon can he cut

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?