Question 46·Easy·Linear Equations in One Variable
Which equation has the same solution as the given equation?
When a question asks which equation has the same solution as a given equation, it is usually fastest to solve the original equation for using normal algebra steps (distribute, combine like terms, and use inverse operations). Once you know the solution value of , quickly test it in each answer choice and see which equation becomes a true statement; that way, you avoid doing full algebra on every option and instead use one solution check to eliminate all but the correct choice.
Hints
Start by simplifying the given equation
Look at . How can you rewrite it without parentheses? Try distributing to both and .
Solve for x in the simplified equation
Once you have an equation like , use inverse operations (undo addition/subtraction, then multiplication/division) to isolate .
Connect the solution for x to the answer choices
After you know the value of that solves the original equation, plug that same into each answer choice. Which equation becomes a true statement?
Desmos Guide
Graph both sides of the original equation
Enter y = -5(x - 2) on one line and y = 35 on another line. Then find the point where the two graphs intersect; note the x-coordinate of this intersection, which is the solution of the original equation.
Check the solution in each answer choice
Using the x-value from the intersection, create a table or just type each left-hand side, like x - 2, and replace x with that value. Compare the result to the right-hand side of each option (for example, -7, 7, etc.) and see which equation becomes a true statement; that option has the same solution as the original equation.
Step-by-step Explanation
Remove parentheses by distributing
Start with the given equation:
Distribute across :
Now you have a simpler linear equation without parentheses.
Solve the linear equation for x
From
subtract from both sides:
Now divide both sides by :
So the solution to the original equation is .
Find which option has the same solution
An equation has the same solution as the original if makes it true.
Test each option by substituting :
- Option A: becomes , which is true.
- Option B: becomes , so , which is false.
- Option C: becomes , so , which is false.
- Option D: becomes , so , which is false.
Only option A) is true when , so it is the equation with the same solution as the original.