Problem 61 - Algebra 2

Question

Write each equation in standard form. Identify A, B, and C. \(6 x=3 y-9\)

Step-by-Step Solution

Answer

The standard form is \(6x - 3y = -9\) with \(A = 6\), \(B = -3\), \(C = -9\).

Step 1: Rearrange the Equation

Start with the equation \(6x = 3y - 9\). Move all terms to one side of the equation to form \(Ax + By = C\). Subtract \(3y\) from both sides to get \(6x - 3y = -9\).

Step 2: Identify Coefficients A, B, and C

In the equation \(6x - 3y = -9\), identify the coefficients A, B, and C. Here, \(A = 6\), \(B = -3\), and \(C = -9\).

Key Concepts

Linear Equations

Linear equations form the backbone of many mathematical problems. They are equations involving two variables, typically represented as "x" and "y," whose graph is a straight line. In standard form, a linear equation is expressed as \(Ax + By = C\), where \(A\), \(B\), and \(C\) are constants.

The beauty of linear equations lies in their simplicity and the straightforward relationship they portray between variables. They model linear relationships, meaning that if you change one variable, the other changes proportionally.

In practical situations, linear equations are used to find unknown values, predict outcomes, and model real-life scenarios such as budgeting and force calculations. Recognizing them and understanding how to manipulate them into standard form are essential skills in algebra.

Coefficients

Coefficients are vital components of linear equations. They appear as constant multipliers of the variables in an equation. In the standard form \(Ax + By = C\), the coefficients are \(A\) and \(B\). These numbers give information on how each variable influences the equation.

Sometimes coefficients can be zero. If \(A\) is zero, the equation represents a horizontal line, as there is no "x" component. If \(B\) is zero, the equation represents a vertical line, since there is no "y" component.

• The coefficient \(A\) affects the horizontal component of the line.
• The coefficient \(B\) affects the vertical component of the line.

Understanding coefficients is crucial because they determine the slope and direction of the line portrayed by the equation.

Solving Equations

Solving equations is a fundamental aspect of algebra. It involves finding the value of the variables that satisfies the equation. The process often requires manipulation of the equation's terms.

For linear equations, solving might mean getting the equation into a particular form, like the standard form. In the given problem, we rearranged the equation \(6x = 3y - 9\) into its standard form \(Ax + By = C\) by performing algebraic operations. These operations include adding, subtracting, multiplying, or dividing terms across the equation:

• First, move all terms to one side to create a "0" on the other.
• Then, rearrange the terms to match the pattern \(Ax + By = C\).
• Finally, identify coefficients \(A\), \(B\), and constant \(C\).

Solving linear equations systematically helps in predicting and understanding relationships between variables in mathematical and real-world contexts.