One of the steps dave used to solve an equation is shown below.
3x+9=21
3x+9−9=21−9
which statement describes the procedure dave used in this step and identities the property that justifies the procedure?
a) dave rearranged the terms. this procedure is justified by the associative property.
b) dave subtracted 9 from both sides. this procedure is justified by the additive property of equality.
c) dave rearranged the terms. this procedure is justified by the commutative property.
d) dave subtracted 9 from both sides. this procedure is justified by the additive inverse.

If myesha works overtime, she gets paid "time and a half" for every hour she works. in other words, for every hour over 40 hours myesha works each week, she gets her hourly pay plus half her hourly pay. what is myesha's pay per hour when she works overtime?

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

Bonnie and bobby are saving money for a vacation. each friend starts with an amount and also saves a specific amount each week. bonnie created a table to show the total she has saved at the end of each week.. weeks 0 1 2 3 4 5 6 7 8 amount saved 12 16 20 24 28 32 36 40 44 bobby came up with the following equation to show the total, y, he has saved at the end of each week, x. y = 12x + 4 compare the rate at which each friend saves money. select the correct answer from the drop-down menu to complete the statement. the rate at which bobby is adding to his savings each week is $ more than the rate at which bonnie is adding to her savings each week.