Question

Which variable is ready to be eliminated? 2x - y =-15 -2x + 5y = 3

Answer 1

We have a system of two equations:

$\begin{gathered} 2x-y=15, \\ -2x+5y=3. \end{gathered}$

We want to reduce the system to an equation with only variables, we see that by adding the equations we can achieve that. This is because the terms with x cancel each other:

$\begin{gathered} (2x-y)+(-2x+5y)=15+3, \\ 4y=18. \end{gathered}$

Answer

i) Variable x is ready to be eliminated.

ii) Adition is required to eliminate the variable.

Reason: by adding the equations we see that variable x is eliminated:

$\begin{gathered} (2x-y)+(-2x+5y)=15+3, \\ 4y=18. \end{gathered}$