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Question 307433: Consider the line 3x+2y=18
A. what is the x-intercept?
B. what is the y-intercept?
C. is the point (3,-2) in the line?
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! 3x+2y=18
The x intercept is where y=0. If y=0, then 3x=18, so x=6.
The y intercept is where x=0. If x=0, then 2y=18, so y=9.
The point (3,-2) means that x=3 and y=-2.
If x=3 and y=-2,
3x+2y
3(3)+2(-2) does NOT equal 18, so NO it is NOT a point on the line.
Please see my own website for additional explanation on Graphing. Do a Google search for my name "dr robert j rapalje," and look for "Rapalje Homepage" near the top of the list. Then find the link "Basic, Intermediate, and College Algebra: One Step at a Time." Select "Basic Algebra," and look in Chapter 4. You will find a complete explanation with examples and exercises, with many of the exercises solved in the MATH IN LIVING COLOR pages that are attached.
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus
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