I don't understand these, please help!

Step-by-step explanation:

2A

x=1 y=3

x=4 y=0

y=mx+b

3=m+b

0=4m+b

3=-3m

m= -1

0=-4+b

b=4

y= -x +4

2B

x=2 y=0

x=0 y= -4

0=2m+b

-4=b

b=-4

0=2m-4

2m=4

m=2

y=2x-4

hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb