Question 65·200 Super-Hard SAT Math Questions·Algebra
If
the value of is between which of the following pairs of values?
For linear equations with multiple fractions, clear denominators first by multiplying by the LCM of all denominators. Distribute carefully, especially across subtraction, then combine like terms to isolate . Only after is found should you compute the requested expression (here, ), and use its sign and size to pick the correct interval.
Hints
Use an LCM to clear fractions
Multiply both sides by the least common multiple of , and so every fraction disappears.
Be careful with subtraction
When you distribute, keep track of the minus sign in front of .
Compute the expression after solving
After you find , plug it into and decide which interval contains the result (a quick decimal estimate works).
Desmos Guide
Graph both sides
Enter
and find their intersection point.
Read the solution for
Click the intersection and note the -coordinate (it should be about ).
Evaluate from the intersection
In a new line, type . Then substitute the intersection’s -value mentally or by creating a table near that -value. The result should be slightly less than , so select the interval that contains a small negative number.
Step-by-step Explanation
Clear denominators
The least common multiple of , and is . Multiply both sides by :
This simplifies to
Distribute and combine like terms
Distribute:
Combine like terms:
Solve for
Subtract from both sides:
So
Evaluate and choose the interval
Compute:
Since is between and , the correct choice is and .