Which system of equations below has exactly one solution? Oy=-8x–6 and y = -8x+6
Oy=-8x –6 and 1/2y=-4x-3
Oy=-8x–6 and y = 8x- 6
Oy=-8x –6 and -y= 8x + 6
Pls hurry me timed :)

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

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