Is this a function or not a function?

What is the equation in point slope form of the line that passes through the point (-1, -3) and has a slope of 4? y-1=4(x-3) or y+3=4(x+1)

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)