Question

is the coordinate (1,2) a solution to the system
y=x+1
2x-y=0

Answer 1

the coordinate (1,2) means
x=1 and
y=2
now try to plug the values of x and y in the given equations and see what u get

Answer 2

so it is right?

Answer 3

consider the first equation
y=x+1
put x=1 and y=2
so u'll get same value in left and right hand side so it is satisfied for the first equation
now try the second one

Answer 4

yeah thats right

Answer 5

yeah so (1,2) is satisfied for both the equations
so u can say that it is a solution of the system