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Kisachek [45]
3 years ago
8

Ryan earns x dollars every seven days. Write an expression for how much Ryan earns in one day. Ryan’s spouse Lee is paid twice a

s much as Ryan. Write an expression for how much Lee earns in one day. Write an expression for their combined daily earnings.
Mathematics
1 answer:
Travka [436]3 years ago
4 0

Answer:

Step-by-step explanation:

R=x/7 let's say R is what Ryan earned, and so he earns x dollars every seven days

L=2(R)

L=2(x/7)Let's say L is what Lee earned, she earned twice as much as Ryan so 2(x/7)

Total=2(x/7)+x/7

Total=3(x/7)   the total earnings is the sum of x/7 and 2x/7 is 3x/7

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we just need the slope

take derivitive
y'=1-2x
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the slope is -1
the perpendicular of that slope is what number we can multiply to get -1
-1 times what=-1?
what=1
duh
so
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y-0=1(x-1)
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solve for where y=x-1 and y=x-x² intersect

set equatl to each other since equal y
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factor difference of 2 perfect squares
(x-1)(x+1)=0
set to zero

x-1=0
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we got this point already

x+1=0
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sub back
y=-1-(-1)²
y=-1-(1)
y=-1-1
y=-2

it intersects at (-1,-2)
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3 years ago
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