Ok, firstly you need to plug in any number you can star by 1, 0 whatever, then add 2 numbers more, only to do accurate the graph and finally add the given number (3) then simplify:
y= 2(3)+4 = 10
B) $10 dollars after 3 days of late.
I'm almost positive that the answer is 3.
Probably the coordinate plane, since there are 2 number lines (which is the x and y axis). Therefore, it it perpendicular and forms a right angle. Hope this helps!