Please help me ); i am so confused

What is the value of x in the diagram below?

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.