How do you find the common denominator for 80 and 1260/23

Question

anonymous · Answer

do you mean lcd for 80 and 23?

anonymous · Answer

I am not sure, I will just give you the whole problem k solve using elimination

anonymous · Answer

0.3x-0.2y=4        0.2x+0.5y=-21/23

anonymous · Answer

just a quick answer as i must go
multiply first equation by 2 and second by 3 
then subtract them to eliminate x
solve resulting equation for y
then plug value of y into one of the equations to find value of x
must go

anonymous · Answer

I multiplyed by 10 to get rid of decimals 
3x-2y=40      2x+5y=-210/23
then multiply the first equation by 2 and the second by -3
6x-4y=80   -6x+-15y=

anonymous · Answer

okay thanks I will try that

amistre64 · Answer

80/1  and  210/23 ; have 23 as a common denominator.

multiply 80/1 by a useful for of 1 in order to change the way it looks without changeing its value.

$$\frac{80}{1}*\frac{23}{23}=\frac{80(23)}{23}$$