![]() 3 x + y = 5 3 x + y = 5īy rewriting y = − 3 x + 5 y = − 3 x + 5 as 3 x + y = 5 3 x + y = 5, we can easily see that it is a linear equation in two variables because it is of the form A x + B y = C A x + B y = C. Step 3: Put it in A x + B y = C A x + B y = C form. We can use the addition property of equality and rewrite it in A x + B y = C A x + B y = C form. But it does not appear to be in the form A x + B y = C A x + B y = C. The equation y = − 3 x + 5 y = − 3 x + 5 is also a linear equation. Here is an example of a linear equation in two variables, x x and y y.Ī x + B y = C A + 4 y = 8 A = 1, B = 4, C = 8 A x + B y = C A + 4 y = 8 A = 1, B = 4, C = 8 An equation of this form, where A A and B B are both not zero, is called a linear equation in two variables. Equations with two variables may be of the form A x + B y = C A x + B y = C. But equations can have more than one variable. In almost every case, when you solved the equation, you got exactly one solution. Up to now, all the equations you have solved were equations with just one variable. Graphing Linear Equations in Two Variables The point ( 3, 5 2 ) ( 3, 5 2 ) is in quadrant I. Since y = 5 2 y = 5 2, which is equal to 2.5, the point is above the x x-axis.
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