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

Question

Mathematics

Tianna Myers

16 April, 03:44

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

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Answers (1)

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Brodie Hart · Answer 1

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