How would I graph this in my TI-83?

[hyde2042]

Homework Statement

|y| = 7-x

The closest I can do is y=abs(7-x), but this just gives me a straight line along the y axis. Thank you for your time.

Homework Equations

The Attempt at a Solution

 

[SammyS]

Homework Statement

|y| = 7-x

The closest I can do is y=abs(7-x), but this just gives me a straight line along the y axis. Thank you for your time.

In this case x is a function of y, rather than y being a function of x.

You can either:

(1). Graph x on the vertical axis & y on the horizontal axis by switching x & y in your equation, then solve for y.

(2). Do a parametric plot: Let y_t = t and x_t = 7 - abs(t), because x = 7 - |y|. Have t go from -20 to 20.​

 

[PeterO]

Homework Statement

|y| = 7-x

The closest I can do is y=abs(7-x), but this just gives me a straight line along the y axis. Thank you for your time.

Homework Equations

The Attempt at a Solution

You could graph two lines: y = 7 - x and -y = 7 - x [better known as y = x - 7]

This would give to two intersecting lines making a large X

You only want two if the branches.

You want either the V, the inverted V [can't type it upside down] or the left hand two [>] or the right hand two [<].

You could test the original expression by chosing a known point on each of the sections, to check which two you want, if you can't think of any other way of doing it.

 

[hyde2042]

Ah. THank you guys. I wish I thought of those methods.

 

[rwisz]

To graph this equation on a TI-83 calculator, you can follow these steps:

1. Press the "Y=" button to access the graphing menu.
2. Enter the equation by typing in "abs(7-x)" in the first line.
3. Press the "WINDOW" button to adjust the window settings. You may need to change the x and y ranges to see the full graph.
4. Press "GRAPH" to see the graph of the equation.
5. You should see a V-shaped graph with the vertex at (7,0) and the arms extending towards the positive and negative x-axis.
6. You can also use the "TRACE" function to find specific points on the graph by pressing the left and right arrows to move along the graph.
7. To clear the graph and enter a new equation, press "Y=" and then "CLEAR" before entering the next equation.