Find the equation of a line passing through (4,2)(4, 2)(4,2) with slope −12-\frac{1}{2}−21.
x−2y=0x - 2y = 0x−2y=0
x+2y=8x + 2y = 8x+2y=8
x+2y=10x + 2y = 10x+2y=10
2x+y=102x + y = 102x+y=10