How can I explain how I got the answer. I received the help, but no explanation to how the answer was simplified. 1=1(-7) +b
b = 8
In other words, you need to explain what you did to simplify 1=1(-7) + b. This is also true for the perpendicular equation process.
2=2(4) +b Simplify
b=-6
1=1(-7) +b
1 = -7 + b
Add 7 to both sides of the equation.
8 = b
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2=2(4) +b
2 = 8 + b
Take it from there.