Use the values X=-0, 5, 0, and 1 to prove your solution to the equation 5+x-12=2x-7 in your final answer, include all of your calculations.

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin