The problem
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If the expression were written as C=25y+10, and y=30x+15, how can I derive an answer in the simplest form such as x=? or x+y=?
Answer provided by our tutors
Your first equation shows solving for 'x' by substituting 'y' with '30x+15'. That resolves for 'x=(C-385)/750'.
The original equation 'C=25y+10' can be solved for 'y=(C-10)/25.
This means 'x+y' can be simplified by adding the 'x=' and the 'y=' inputs:
(C-385)/750+(C-10)/25
yielding (31C-685)/750
