Add 5 to both sides The Addition Property of Equality
The formula for the problem is: An = 8(n-1) - 2
<em>You've simplified it as much as possible.</em>
<em>Let x equal length of flight in hours.</em>
<em>At first, the inequality was:</em>
<em>x ≈ 5</em>
<em>But with the delay, the inequality is now</em>
<em>x ≥ 6.</em>
Set up the following equations:


x represents car A's speed, and y represents car B's speed.
We'll use elimination to solve this system of equations. Multiply the first equation by 7:


Combine both equations:

Divide both sides by 28 to get x by itself:

The speed of car A is
80 mph.Since we now know the value of one of the variables, we can plug it into the first equation:


Subtract 160 from both sides.

Divide both sides by 2 to get y by itself:

The speed of car B is
60 mph.