SOLUTION: A compass and ruller costs for $4.00 together. The compass is .90 more than the ruler. How much does the compass costs?

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Question 178470: A compass and ruller costs for $4.00 together. The compass is .90 more than the ruler. How much does the compass costs?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let the compass and the ruler cost be c and r, respectively
:
c+r=4......eq 1
c=r+.9.....eq 2
:
take c's value of r+.9 from eq 2 and plug it into eq 1
:
r+.9+r=4
:
2r=3.10
:
$highlight%28r=1.55%29costs of rulers
:
from eq 2:c=r+.9$highlight%28c=1.55%2B.9=2.45%29cost of compasses
:
1.55+2.45=$4.00