Suppose you have the following system of linear equation:
[tex]\left \{ {{(1) \ ax+by=c} \atop {(2) \ dx+ey=f}} \right.[/tex]
According to the statement above, first we need to solve for x in the second equation:
[tex]dx+ey=f \\ \\ \therefore x=\frac{f-ey}{d}[/tex]
Next we need to substitute x into the first equation, so:
[tex] a\left(\frac{f-ey}{d}\right)+by=c [/tex]
So, the conclusion is that from this last equation the result we can get is y. Then, by substituting the value of y in the first or second equation we can get x.
Answer: solve for c in a second equation and substitute: correct is 2(-3+2y) +5y= -6. 100% correct.
Step-by-step explanation:
