Texas Instruments TI-83 User Manual

EXAMPLE 2 Using INTERSECT to Approximate Solutions of an Equation
Find the solution(s) to the equation 3(x - 2) = 5(x - 1). Round answers to two decimal
places.
SOLUTION
Graph each side of the equation: Y
1
= 3(x - 2); Y
2
= 5(x - 1) using the viewing window
Xmin = -4, Xmax = 4, Xscl = 1, Ymin = -15, Ymax = 5, Yscl = 5.
To determine the solution, find the x-coordinate of the point of intersection. Select the
CALC menu (2
nd
TRACE). Select option 5: INTERSECT by either highlighting
INTERSECT or Pressing 5.
The calculator displays the following:
If you press the left or right arrow, you should notice the cursor TRACEing along Y
1
.
Move the cursor near the point of intersection of the two graphs and press ENTER.
The screen displays the following:

Texas Instruments TI-83 Specifications

General

Programming	TI-BASIC
Processor	Zilog Z80, 6 MHz
Weight	7.4 oz (210 g)
Display	96x64 pixels, monochrome LCD
Power Source	4 AAA batteries, 1 CR1616 or CR1620 for backup
Memory	32 KB RAM
Connectivity	2.5mm I/O port for linking with other TI calculators