This means that we should solve the given system of equations and make our conclusion based on the result.
Solve by Elimination
To solve a system of linear equations using the Elimination Method, one of the variable terms needs to be eliminated when one equation is added to or subtracted from the other equation. In this exercise, this means that either the x-terms or the y-terms must cancel each other out.
4x- 8y=15 & (I) - 5x+ 10y=- 30 & (II)
In its current state, this will not happen. Therefore, we need to find a common multiple between two variable like terms in the system. If we multiply (I) by 5 and multiply (II) by 4, the x- and y-terms will have opposite coefficients.
5(4 x-8 y)=5(15) 4(- 5 x+10 y)=4(- 30) ⇒ 20x- 40y=75 - 20x+ 40y=- 120
With this, we can see that both the x- and y-terms will eliminate each other if we add (I) to (II).
