Practice 1.) Solve for y : 4x + 2y = -8 2.) Solve for y: 3x – 5y = 10 3.) Graph the equation: 3x – 2y = 5 x y O 5 5 5 5
Jan 05, 2016
Practice1.) Solve for y : 4x + 2y = -8
2.) Solve for y: 3x – 5y = 10
3.) Graph the equation:3x – 2y = 5
x
y
O 5
5
5
5
Solving Systems of 2 linear equations by graphing
-8x -8x
-3x -3x
÷-1 ÷-1 ÷-1
÷2 ÷2 ÷2
(0,-8)
-4x -4x
-3x -3x
÷-5 ÷-5
÷-5 ÷-5 ÷-5
(5,4)
-3x -3x
-3x -3x
÷2 ÷2 ÷2
÷2 ÷2 ÷2
No Sol.
There are 2 ways to do this on the calculator.
You can graph them both and then make sure they intersect on the screen. Then press 2nd trace(calculate) then press 5 (intersect) followed by enter 3 times and the x and y values of the point of intersection will appear at the bottom of the screen.
The other way is to graph both equations then press 2nd graph(table) and you will see 3 columns x y1 and y2 this is telling you all the points for the 2 equations using the x. you want to find the one where the y is the same and then that y with the x that makes them the same is your point of intersection.
There are 3 possible ways for system of equations to be graphed . Therefore, there are
3 types of solutions.
You try theseSolve each system by graphing or using a table. classify each system as independent, dependent, orinconsistent Check your answers.