5
If you mean: y = 2x-4 and (1, 5) then the parallel equation is y = 2x+3
y2x is an expression, which cannot be graphed because we don't know what it equals. y = 2x, y2 = x, and 2y (or y2) = x are all things that could actually be graphed.
If you mean y = 2x then it is a straight line equation
Blue is not a solution.
Thanks to the browser, it is not possible to tell what the inequalities are.
Without any equality signs the given expressions can't be considered to be equations so therefore there are no solutions.
Without a second independent equation, it's not a 'system' yet.
5
If you mean: y = 2x+5 then it is a straight line equation.
If you mean: y = 2x+5 then yes it is a linear function of straight line
y2x - just double the coordinate of y to get x. xy12 - i have no idea
5
If you mean: y = x^2+4x+3 and y = 2x+6 Then the solution is: x = 1 or x = -3
11
5
Since there is no equality (or inequality) sign in the question, there is no equation or inequality) and therefore nothing which can be solved.