What type of solutions do the methods for solving systems of equations find and how does this relate to setting the equations equal to each other?6.05

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position