1. if 3(x+1)=7 find the value of 3x2.    if -3(y-1)=9 find the value of 1/2y  3. if 4-7x=39 find the value of x+1

1)

3(x + 1) = 7

3.x + 3.1 = 7

3x + 3 = 7

3x = 7 - 3

3x = 4

x =

3x = 3.\frac{4}{3}[/tex]

3x = 4

2)

-3(y - 1) = 9

-3.y - 3 . (-1) = 9

-3y + 3 = 9

-3y = 9 - 3

-3y = 6

y = 6/-3

y = -2

3)

4 - 7x = 39

-7x = 39 - 4

-7x = 35

x = 35/-7

x = -5

x = -5

x + 1 = -5 + 1

x + 1 = -4

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

practice. practice. practice.