1 answer:
Given:
The first customer paid $17 for 7 small envelopes and 3 memo pads.
The second customer paid $28.75 for 12 small envelopes and 5 memo pads.
To find:
The cost in dollars of each memo pad.
Solution:
Let x be the cost of each small envelop and y be the cost of each memo pad.
The first customer paid $17 for 7 small envelopes and 3 memo pads.
...(i)
The second customer paid $28.75 for 12 small envelopes and 5 memo pads.
...(ii)
Multiply equation (i) by 12 and equation (ii) be 7 to get same coefficient of x.
...(iii)
...(iv)
Subtracting (iv) from (iii), we get
Therefore, the cost of each memo pad is $2.75.
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Answer:
(a)
if then
and if x<0 then
(b)
That is straightforward from what you showed on theorem 3.25
(c)
Following the same ideas from (a) x>a or -x > a.
Step-by-step explanation:
Remember how we define the absolute value of a number.
(a)
In general
Therefore if you have two cases, if
then
and if x<0 then
(b)
That is straightforward from what you showed on theorem 3.25
(c)
Following the same ideas from (a) x>a or -x > a.