\[ 12x - 3y = 27 \] - Coaching Toolbox
Understanding the Linear Equation 12x - 3y = 27: A Comprehensive Guide
Understanding the Linear Equation 12x - 3y = 27: A Comprehensive Guide
The linear equation 12x - 3y = 27 is a fundamental example of a first-degree linear relationship between two variables, x and y. Whether you’re a student learning algebra or a professional seeking a clear breakdown, understanding this equation unlocks deeper insights into linear programming, graphing, and real-world applications. In this SEO-optimized article, we explore the equation’s structure, method of solving, graphical representation, and practical uses.
Understanding the Context
What Does 12x - 3y = 27 Represent?
The equation 12x - 3y = 27 is a linear Diophantine equation, commonly used in algebra and applied mathematics. It describes a straight line when graphed on the Cartesian coordinate plane:
- 12x represents the linear term involving x,
- -3y represents the term involving y,
- 27 is the constant term that shifts the line vertically.
Rearranged, it can be expressed as:
Image Gallery
Key Insights
> y = 4x - 9
This slope-intercept form reveals the equation’s slope (slope = 4) and y-intercept (y = -9), critical for graphing and interpretation.
Step-by-Step: Solving 12x - 3y = 27
To manipulate or solve the equation efficiently, follow these basic algebraic steps:
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Isolate y
Start by moving 12x to the other side:
-3y = -12x + 27
Divide each term by -3:
y = 4x - 9 -
Determine Slope and Intercept
As shown, the simplified form reveals:- Slope (m) = 4
- Y-intercept = -9 (the line crosses the y-axis at (0, -9))
- Slope (m) = 4
-
Check Solutions
Plugging in values for x gives corresponding y-values. For example:- When x = 0 → y = -9
- When x = 3 → y = 12 – 9 = 3
Substituting (3, 3) into 12(3) – 3(3) = 36 – 9 = 27 confirms validity.
- When x = 0 → y = -9
Graphing 12x - 3y = 27
Graphing the equation reveals its position in the coordinate plane:
- Plot the y-intercept at (0, -9)
- Use the slope of 4 (rise over run: 4/1) to find a second point: move up 4 units and right 1 unit to point (1, -5)
- Draw a straight line through these points; extend in both directions.
Graphing tools or plotting software can verify this, enhancing understanding for visual learners.
