In order for two lines to be perpendicular, their gradients must multiply together to get -1
7*b=-1
7b=-1
Divide both sides by 7
So, the gradient of line b is -1/7
20% × 6 = (20/100) × 6 = 1.2
the picture isn’t showing up
87.3 for 3 58.2 for 2 hope it helps
