Rational Expressions and Equations
posted by April .
How do you know when to move the number to the left or the right.
What are you trying to do? Solve for the unknown (x or y?)
First get rid of the fractions that have the unknowns in the denomimator. It is not a question of moving right or left.
In the first case,
7(x-5) = 5(x+8)
7x -35 = 5x + 40
2x = 75
x = 37.5
I know the first problems answer is 2/75 and the second is 5 and in both cases I seem to mess up on the last part of moving the numbers like for instance in the 2/75 I first had the answer of 75/2 I had the numbers right but the wrong placement and the same with the other I first had 4/20 instead of 20/4 which equals 5 so I need to know how do you know which way to move the number to the left or the right?