The gradients of perpendicular lines multiply to make -1. The gradient of the line given is 2, so 2 multiplied by something gives us -1. 2 × -1/2 = -1. The gradient of the perpendicular line is -1/2
y = -1/2x + c
Now we can substitute x = 1 and y = 3 into the equation:
|-3| is the absolute value of -3 which is 3 and then the -3 is just as is.. if you were looking for how much is between the two numbers, you you simply count, like for these two it would be 6
