Substituting a=-2 into the relation, we get |2b-2|= 14, b=8, or b=-6.
A+B = 6 or -8
2. Solution: Party A's clothing cost is X yuan, and Party B's clothing cost is Y yuan.
Column x+y=500
0.9[( 1+50%)x+( 1+40%)y]= 157+x+y
The solution is x=300.
y=200
A: The cost of clothing A is 300 yuan, and the cost of clothing B is 200 yuan.
3. Solution: Let the original speed be x km/h, then the distance between AB and AB is 7x km.
Column 7x=5(x+20)
The solution is x=50.
Then, the distance between AB and AB is 7×50=350 (km).
A: AB is 350 kilometers apart.