I need help with this - I know I need to multiple by 100 to get ride of the decimals

solve by the elimination method 0.5x-0.2y=4 0.5x+0.3y=-7/17

3x-2y=40 5x+3y=-70/17

Then I am lost - can some help me?

Question

I need help with this - I know I need to multiple by 100 to get ride of the decimals

solve by the elimination method 0.5x-0.2y=4 0.5x+0.3y=-7/17

3x-2y=40  5x+3y=-70/17

Then I am lost - can some help me?

anonymous · Answer

after multiplying with 10, the first equation should be:
$$5x - 2y = 40$$
probably just a typo, tho...

anonymous · Answer

you are right - typing to fast - the problem is 

0.3x-0.2y=4  0.5x+0.3y=-7/17

anonymous · Answer

multiply by 100

anonymous · Answer

why by 100?

anonymous · Answer

3x-2y=40 and 5x+3y=-70/17    you do this to get rid of the decimals

anonymous · Answer

that's correct (altough unnessesary). But this was a multiplication with 10!

0.3x multiplied with 100 would be 30x !

anonymous · Answer

Now - 'elimination method' means, multiply one equation with some factor, so that, after adding both of the equations together either x or y is eliminated...

Can you come up with something on your own?

anonymous · Answer

You are right I went back to notes - for elimination method it multiplication of 10 not 100