A nursery owner buys 7 panes of glass to fix some damage to greenhouse. The 7 panes cost $20.65. Unfortunately, breaks 3 more
2 answers:
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The equation given to us is called a literal equation. An equation made up of a whole bunch of different variables. If we need to isolate the l, we first have to get it out from inside that set of parenthesis. Do that by distributing the 2 in to get P = 2L + 2w. We will subtract 2w from both sides to get P - 2w = 2L, and then we have to divide everything by 2 to get L alone. That leaves us with
. That is also the same thing as
, whichever one you want. Now, solving 4w - 7k = 28 for k requires that we subtract 4w from both sides leaving us with -7k=28-4w. Now we divide everything by -7 and we end up with
, which is also the same thing as
if you don't like to start with a negative.