Question

Rewrite each equation in general form. $$y=-2 x+6$$

Short answer

The general form of the equation is 2x + y - 6 = 0.

Step-by-step solution

Identifying General Form

The general form for a linear equation in two variables x and y is Ax + By + C = 0, where A, B, and C are real numbers. To write the given equation in the general form, rearrange it so it fits this pattern.

Rearrange Equation

To transform the equation y = -2x + 6 into general form, move all terms to one side of the equation, resulting in 0 on the other side. Start by adding 2x to both sides of the equation, leading to the step 2x + y = 6.

Final General Form

Now that all terms are on one side, and the other side of the equation equals 0, the equation is in general form. The final general form is 2x + y - 6 = 0.

Key concepts

Linear Equations

In algebra, a linear equation is one of the simplest forms of equations and is the starting point for students delving into the world of algebra. It is called linear because it represents a straight line when graphed on a coordinate plane. The standard linear equation takes the form of y = mx + b, where m is the slope of the line and b is the y-intercept, or the point where the line crosses the y-axis.

A linear equation can be written in several forms including slope-intercept form, point-slope form, and general form. The general form, typically written as Ax + By + C = 0, where A, B, and C are real numbers, and A and B are not both zero. This form is particularly useful for algebraic manipulations and solving systems of linear equations.

Solving Linear Equations

The process of solving linear equations requires finding the value of the variable that makes the equation true. To solve the equation y = -2x + 6, for instance, we aim to isolate y on one side. But when converting to general form, we focus on rearranging the equation so that it equals zero.

To solve linear equations, you'll often perform operations such as adding, subtracting, multiplying, or dividing both sides of the equation by the same number to maintain equality. It’s essential to understand these operations and apply them correctly to reach a solution or to transform equations into different forms seamlessly.

Algebraic Manipulation

The term algebraic manipulation refers to the process of rearranging and simplifying algebraic expressions and equations. This encompasses a variety of operations, including expanding brackets, factoring, collecting like terms, and the laws of algebra (e.g., commutative, associative, and distributive laws).

For example, let’s consider the transition from y = -2x + 6 to its general form. To successfully manipulate this equation, you need to 'move' terms from one side of the equal sign to the other by performing inverse operations. Adding 2x to both sides gives us 2x + y = 6. We're applying the principle of maintaining balance in the equation; what is done on one side must be replicated on the other side for the equation to remain true. The final step is to subtract 6 from both sides, leading to 2x + y - 6 = 0, which is the required general form.