Question 50·Medium·Linear Equations in One Variable
The equation
is given. What value of satisfies the equation?
For linear equations with fractions, first use the distributive property to remove parentheses, then combine like terms. To save time and avoid fraction mistakes, multiply both sides by the least common multiple of the denominators to clear all fractions. After that, solve the simpler equation by getting all x-terms on one side and constants on the other, and double-check by quickly plugging your answer back into the original equation.
Hints
Start by expanding
Look at the expressions and . Use the distributive property: multiply the fraction by both terms inside each set of parentheses.
Combine like terms carefully
After distributing, focus on the constant (number) terms on the left side. Rewrite whole numbers as fractions with a common denominator so you can add or subtract them accurately.
Remove fractions, then isolate x
Once you have an equation with fractions, multiply both sides by a common denominator (such as 4) to clear the fractions, then collect all terms on one side and constants on the other.
Desmos Guide
Enter each side of the equation as a separate function
In Desmos, type y = (3/4)(x - 2) + 5 for the left-hand side and y = (1/2)(x + 6) for the right-hand side. You will see two lines on the graph.
Find the intersection point
Adjust the viewing window if needed so the point where the two lines cross is visible. Tap or click on the intersection point and note the x-coordinate; that x-value is the solution to the equation.
Step-by-step Explanation
Distribute to remove parentheses
Start with the given equation:
Use the distributive property on both sides:
- Left side:
- Right side:
So the equation becomes:
Combine like terms and clear fractions
On the left side, combine the constant terms and .
Write as a fraction with denominator 2: .
Then:
So the equation is now:
To eliminate fractions, multiply every term on both sides by 4 (the least common multiple of 4 and 2):
This simplifies to:
Solve the simple linear equation
Now solve .
- Subtract from both sides to get all terms on one side:
- Subtract 14 from both sides to isolate :
So the value of that satisfies the equation is , which corresponds to choice A.