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patriot [66]
3 years ago
15

Systems of equations pls help!

Mathematics
1 answer:
timama [110]3 years ago
8 0
Equation 1 + equation 2

3x-8y +(-3x+10y) = 9+(-15)
2y= -6
then y=-3

from equation 1
3x-8y=9
3x-8(-3)=9
3x+24=9
3x=9-24=-15
then x=-5
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Abigail is 8 years older than Cynthia.Twenty years ago Abigail was three times as old as Cynthia.How old is each now?
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Let 
C=Cynthia's age today
A=Abigail's age today

then
at all times
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simplifying
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Equate (1) and (2),
C+8=3C-40
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Answer:
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3 0
3 years ago
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