Question

Find AB.
AC - 3x - 5
BC = 10
AB = -7 + 2x

Answer 1

Answer:

AB = 9

Step-by-step explanation:

Using segment addition

AB + BC = AC

-7 +2x + 10 = 3x-5

Combine like terms

3 +2x = 3x-5

Subtract 2x from each side

3+2x-2x = 3x-2x -5

3 = x-5

Add 5 to each side

3+5 = x-5+5

8 =x

AB = -7+2x

    -7 +2(8)

    = -7+16

    = 9

Answer 2

-3x-5+10=-7+2x
combine like terms
-3x+5=-7+2x
+3x +3x
5=-7+5x
+7 +7
12=5x
divide both sides by 5
2.4=x

sub in x into the AB equation

AB= -7+ 2(2.4)
AB= -2.2