Simultaneous equations like 𝒚 = 2𝒙 - 1 and 𝒚 = 𝒙 + 1 can be represented graphically. To solve the equations graphically, the two lines 𝒚 = 𝒙 + 1 and 𝒚 = 2𝒙 - 1 are drawn on the same diagram.

While working on the iDEN line of cell phones at Motorola, the author dropped a steel ball 0.5 m onto the phone cover, collected data, and then simulated the event in FEA software. Combining applied ...