Question 59·Medium·Linear Equations in One Variable
What value of satisfies the equation above?
(Express the answer as an integer)
For equations where both terms share the same binomial factor (like ), first factor out that common factor to turn the problem into a single coefficient times the binomial. Then carefully combine the fractional coefficients using a common denominator, clear any remaining fraction by multiplying both sides, and finally solve the resulting one-step linear equation. This approach cuts down on distribution errors and makes the algebra quicker and cleaner on the SAT.
Hints
Notice a common factor
Look at the left side: both terms involve . How could you factor out to make the expression simpler?
Combine the fractional coefficients
After factoring out , you will have something like . Carefully subtract from using a common denominator.
Remove the fraction
Once you have a single fraction multiplying , think about what you can multiply both sides by to eliminate the fraction.
Final step to isolate x
When you get an equation like , what operation will isolate ?
Desmos Guide
Enter the two sides of the equation as functions
In one line, type y = (2/3)(x-3) - (1/6)(x-3). In another line, type y = 5. This graphs the left side and right side of the equation as two functions.
Find the intersection point
Look for the point where the two graphs intersect. Click on the intersection; the x-coordinate of this point is the solution to the equation.
Step-by-step Explanation
Factor out the common term
Notice that both terms on the left share the factor :
So the equation becomes
Combine the fraction coefficients
Find using a common denominator of :
So
Now the equation is
Clear the fraction
To get rid of the , multiply both sides of the equation by :
which simplifies to
Solve for x
Now solve the simple linear equation:
Add to both sides:
So the value of that satisfies the equation is .