Question 1128603

You want to get rid of the y by elimination in the system below: x-6y=35; 
10x-2y=35. If you multiply the top equation by 4, by which number will you multiply the bottom equation?
<pre>Multiply by 12 or - 12, but that's very INEFFICIENT though.
If it matters, the best way to eliminate y is to MULTIPLY eq (ii) by - 3 to get eq (iii). Then, ADD eqs (iii) & (i).