A) 2x-5y=10
4x-10y=20
b) 2x+5y=10
4x+10y=20
c) 2x+5y=10
4x-10y=20
d) 2x-5y=10
4x+10y=20

Step-by-step explanation:So to find it you need to eliminate either x or y. 2x-5y=10 over 4x-10y=20. In order to get y to eliminate you need one equation to have a positive 10y and a negetive 10y. So you multiply both sides of the first equation by negetive 2 so it is now, -4x+10y=-20. Notice how all the numbers in both equations are opposite this gives us ims infinitaly many sollutions. So it is not A. Or b it will do the same thing. The answer is either D or C hope this helps

one of each metals

step-by-step explanation: