Question 1205745
<br>
40y = 60x
y = x+1/2<br>
When one of the two equations tells you precisely what one variable is in terms of the other, the obvious choice for a solution method is substitution.  Replace "y" in the first equation with the equivalent expression "x+1/2".<br>
40(x+1/2) = 60x
40x+20 = 60x
20 = 20x
x = 1<br>
A. x is the number of hours Karissa drives.  ANSWER: x = 1<br>
B. y is the number of hours Trashia drives.  ANSWER: y = x+1/2 = 1 1/2<br>