SAT Math 3.4 Algebra and Functions
|Functions||Equations and Graphs of Linear|
|Heart of Algebra||Linear functions in two variables (word problems)|
|Product Type||SAT Math|
|SAT Math||Algebra and Functions|
|Systems of Equations||Graphing|
something else, it's just asking us to isolate the variable.
So let's get started. We need to isolate y.
We can do this by putting all the terms with y's on one side first.
We subtract y from both sides, and 2 from both sides.
Next, we'll factor out the y on the left side of the equation, and we're left with y times
the quantity 2x - 1 is equal to 1/x - 2.
Then, we divide both sides by 2x - 1, so our y is isolated.
We can factor out 1/x from the top half of the right side,
and we'll be left with (1/x)(1 - 2x) on top.
Now, the top has 1 - 2x, and the bottom has 2x - 1.
Well look at them closely...they're just negatives of each other.
So, we can rewrite the bottom as -1 times 1 - 2x
We can clearly see that 1 - 2x can be cancelled out.
We're left with y = -1/x.
So our answer is (A).