
Now, we can just multiply it and obtain the result

I used law presented on this example
Point slope form is y - y1 = m(x-x1)
So,
y - (-1) = 2(x - 1)
y + 1 = 2x -2 or y + 1 = 2(x -1)
Hope this helps :)
360 is the answer because 90 times 4 is equal to 360
Multiply using the distributive property so it would be 5x+60
35x5=175
175x1=175
25x7=175