Solve by elimination:

-6x+3y=-4

-20x+10y=20

i know the answer is no solution, but i need to know why.

Ok, there's no solution because of the like term grouping

Step-by-step explanation:

For eg; 2w+3x+4w will be equal to

6w+3x which is a like term grouping. So only if there are like terms, there will be a solution.