Perpendicular lines have the negative reciprocal slope, so the slope of your new line will be -1/4 and the current equation will be as follows: y = -1/4x + b (where b is the y intercept)
to find b, plug in point A and you'll get: 2 = -1/4(16) + b 2 = -4 + b 6 = b
to round to the nearest hundredth, you need three or more numbers on the right side of the decimal point. with this number you can't round to the nearest hundredth.
