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If you mean: y = 2x+5 then it is a straight line equation.
The y value will equal 15, when x = 7
3
Thanks to the browser, it is not possible to tell what the inequalities are.
Without any equality signs the given expression can't be considered to be straight line equations.
If you mean: y = 2x+5 then it is a straight line equation.
5
The y value will equal 15, when x = 7
Since there is no equality (or inequality) sign in the question, there is no equation or inequality) and therefore nothing which can be solved.
3
y2x - just double the coordinate of y to get x. xy12 - i have no idea
6
If you mean y = 2x then it is a straight line equation
If you mean y = 2x-2 then it is a straight line equation whereas the slope is 2 and the y intercept is -2 and its coordinates would be plotted on the Cartesian plane.
9
Thanks to the browser, it is not possible to tell what the inequalities are.
If you mean: y = 2x+8 then it is a straight line equation whereas 2 is the slope and 8 is the y intercept