7x+7y=-21 and 4x-2y=22 solve each system by substitution

List the 10 possible samples (without replacement) of size 3 3 that can be obtained from the population of five officials.

For the equations below which statement is true ? -2x=14 6x=-42

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21