Question 914249
-2x+y=24
5y  =10x+120


The brackets just indicate that they are a set of equations. A linear system with two variables x & y


-2x+y=24

rearrange
y=2x+24

substitute y in the equation below

5y  =10x+120

5(2x+24) =10x+120

10x+120= 10x+120

10x-10x=120-120
0=0

The solution of one equation satisfies the other equation.

Hence 
The system is consistent and  has innumerable or infinite solutions.
and dependent