Posted by Anonymous, on Friday, August 15, 2008 at 4:02pm.
the first equation of the system is mutiplied by 4, by what number would you mutiply the second equation to eliminate the y variable by adding? first: 2x+5y=16 second:8x  4y =10 i got 2 0r 5 im not sure which one

algebra ll  bobpursley, Friday, August 15, 2008 at 4:15pm
Mulitpy it by 5, so that the coefficent of y in each is 20.

algebra ll  Anonymous,, Friday, August 15, 2008 at 4:20pm
so the answer is negative 5 right

algebra ll  drwls, Friday, August 15, 2008 at 4:39pm
No. It is +5, as Bob correcly stated. The coefficient of y in the second equation then becomes 20, so you can eliminate that variable by adding to the first equation.