Question

Solve by substitution. {y=2x {5x-y=30 ( ?,? )

Answer 1

\[\begin{array}{rcl}
y &=&2x\\
5x-y&=&30 \\
&&&\text{Here is the substitution step}\\
5x-(2x) &=& 30
\end{array}
\]

Answer 2

Then you have 3x=30
You do the rest... hint hint

Answer 3

Okay Thanks.:))