GRaph each functions, the point where the 2 funcions cross each other is the solution of the system.
x+y= 3
Solve for y =
y= 3-x
Slope intercept form:
y=mx+b
Where:
m= slope ( rise /run)
b= y intercept ( where the line crosses the y axis)
m= -1
b= 3
And for:
4x+y=6
y=-4x+6
m=-4
b=6
Solution: (1,2)