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Use the equations c = 100 - d and c = 20 +d to model the equation. Solve the system using substitution
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Use the equations c = 100 - d and c = 20 +d to model the equation. Solve the system using substitution

User DocOc
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you can substitute 20 + d for c in the first equation which gives you

20+ d = 100 - d then solve
2d = 80
d= 40
then put the value for d back into one of the original equations
c= 20 + d
c = 20 + (40)
c = 60
User Mrstif
by
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