Answer:
see below
Step-by-step explanation:
13. (8-x)/2 = (2x+2)/5
Using cross products
5(8-x) = 2(2x+2)
40 -5x = 4x+4
Add 5x to each side
40-5x+5x = 4x+5x+4
40 = 9x+4
Subtract 4 from each side
40 -4 = 9x
36 =9x
Divide by 9
36/9 =9x/9
4 =x
14.(x+2)/7 = (3x+6)/5
Again using cross products
5(x+2) = 7(3x+6)
5x+10 = 21x+42
Subtract 5x from each side
10 = 21x-5x +42
10 =16x+42
Subtract 42 from each side
-32 = 16x
Divide by 16
-2 =x
15.(1-x)/2 = (3-x)/3
Again using cross products
3(1-x) = 2(3-x)
3 -3x = 6 -2x
Add 3x to each side
3 = 6-2x+3x
3 = 6+x
Subtract 6 from each side
3-6 =x
-3 =x
