PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA POINTS*..
IM GIVING 40 POINTS !! DONT SKIP :((.

Step-by-step explanation:

(29, 35) (43, 21)

(21 - 35)/(43 - 29) = -14/14 = -1

y - 35 = -(x - 29)

y - 35 = -x + 29

y = -x + 64

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this

it would open into a square depending on the type of envelope i’m not sure about the second part