Z varies directly with x and varies inversely with y. when x=2, y=8, z=3, what is the answer for k? BRAINLIEST TO CORRECT ANSWER!!!

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Is the point (0, 8) on the x-axis or y-axis? how do you know?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?