Graping system of equations: x + 2y = -7, 2x - 3y = 0

pammcf said:
x + 2y = -7
2x - 3y = 0
Click to expand...
Yes, this is a system of equations, and yes, it can be graphed.

Eliz.
 
pammcf said:
could you show me how. What number would I used to graph it.
Click to expand...
Hmm... They were supposed to cover simple linear graphs long before you got to systems of equations....

Since we cannot here provide the missing classroom lectures, you'll need to try self-study:

. . . . .Google results for "plotting points plane"

. . . . .Google results for "graphing linear equations"

. . . . .Google results for "slope straight line"

. . . . .Google results for "solving literal equations"

. . . . .Google results for "slope intercept graph"

. . . . .Google results for "solving systems linear equations"

The first list will explain the basics of the plane and how to plot points. The next four lists will explain the terms and techniques for graphing linear equations, solving for "y=" first, if necessary. The last list will explain what systems of equations are, and how to solve them by graphing (in addition to other methods).

Once you have read at least two lessons from each link, please attempt the exercise. If you get stuck, you will then be able to provide a clear listing (or description) of your work and reasoning so far.

Thank you! :D

Eliz.
 
x + 2y = -7
2x - 3y = 0

For the first equation, it is easy to graph the line using its intercepts. If x = 0, y = -7/2. If y = 0, x = -7.

For the second equation, solve for y: -3y = -2x y = (2/3)x. Now, if x = 3, y = 2; if x = -3, y = -2.

After you draw the graphs CAREFULLY, you will find that the lines intersect at (-3, -2).
 
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