Isolating a variable in two equations is easiest when one of them has a coefficient of 1. let's say we have the two equations 3a−b=5 2a+3b=−4 and want to isolate one of the variables, such that it appears by itself on one side of the equation. which of the following is an equation with one of the above variables isolated?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?