The levels of mercury in two different bodies of water are rising. In one body of water the initial measure of mercury is 0.05 parts per billion (ppb) and is rising at a rate of 0.1 ppb each year. In the second body of water the initial measure is 0.12 ppb and the rate of increase is 0.06 ppb each year.
What is the justification for the step taken from line 2 to line 3?

What is the solution to the linear equation?2.8y + 6 + 0.2y = 5y – 14
What is the solution to the linear equation?d – 10 – 2d + 7 = 8 + d – 10 – 3d
Solve the equation.–3x + 1 + 10x = x + 4


Solve the equation.y + 6 = –3y + 26
Two runners are saving money to attend a marathon. The first runner has $112 in savings, received a $45 gift from a friend, and will save $25 each month. The second runner has $50 in savings and will save $60 each month.
What is the solution to the linear equation?x – = + x



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