Question

For the substitution method do you put the variable in front?
ex: 4r+s=19
-4r -4r
s=?

Answer 1

What do you mean substitution method, you're subtracting 4r from both sides, why?

Answer 2

I have to use the substitiution method to answer this question: \[5r+2s=23 \]
\[4r+s=19\]

Answer 3

\[4r+s=19\]
\[4r=19-s\]
\[4r-19=-s\]
\[\frac{ 4r-19 }{ -1 }=\frac{ -s }{ -1 }\]
\[s=-4r+19\]

Plug in for s in first equation.

\[5r+(-4r+19)=23\]
\[5r+-4r+19=23\]
\[r+19=23\]

Subtract 19 from 23

\[r=4\]