Solve the following systems of linear equations graphically 2x + y +6=...
Solving Systems of Linear Equations Graphically
Introduction
When we have two or more linear equations with two variables, we can find their solutions by graphing them on the coordinate plane. The point where the lines intersect is the solution to the system of equations.
Problem
Solve the following system of linear equations graphically:
2x + y = 6
3x - 2y - 12 = 0
Solution
Step 1: Rewrite Equations in Slope-Intercept Form
To graph the equations, we need to rewrite them in slope-intercept form, which is y = mx + b, where m is the slope and b is the y-intercept.
2x + y = 6
y = -2x + 6
3x - 2y - 12 = 0
-2y = -3x + 12
y = (3/2)x - 6
Step 2: Plot the Lines on the Coordinate Plane
Now we can graph the lines on the coordinate plane by plotting their y-intercepts and using their slopes to find other points on the line.
The first equation has a y-intercept of 6 and a slope of -2. We can plot the point (0, 6) and use the slope to find another point, such as (3, 0).
The second equation has a y-intercept of -6 and a slope of 3/2. We can plot the point (0, -6) and use the slope to find another point, such as (4, 0).
Step 3: Find the Solution
The point where the lines intersect is the solution to the system of equations. In this case, it is (2, 2).
Therefore, the solution to the system of equations is x = 2 and y = 2.