100 points Charlie bikes 9 miles every day.

Days (d)
1
2
3
4
5
Miles (m)
9
18
27
36
45

Which equation models the situation?
9 = dm
d = 9m
9d = m
d = 9 + m

9d=m

Step-by-step explanation:

the slope is 9 and miles is 9 times so it must be 9d=m

m = 9d

Step-by-step explanation:

We can find the slope by taking two points

(1,9) and (2,18)

and using

m =(y2-y1)/(x2-x1)

   =(18-9)/(2-1)

   =9/1

The equation for a line

y= mx+b where m is the slope and b is the y intercept

y = 9x+b

Substitute in a point to determine b

9 = 9(1)+b

9=9+b

b=0

y= 9x

Changing the letters

m = 9d

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

you would need to also lose 1 point for each of the other outcomes for it to be fair.

step-by-step explanation: