Can you name the Unknowns? by Human_Calculator

Equations	Solutions	Extra Info
x+2y=10 3x+y=15?		Solve for x and y.
2x+4y=20 6x+2y=30?		Solve for x and y.
2x+3y-z=-7 -4y+6z=26 5x+9y+2z=-7?		Solve for x and y.
2x+3y-z=-7 -4y+6z=26 6x+9y-3z=-21?		Solve for x and y.
x+4y+2z=-1 5x+25y+z=3 2x+3y+az=b?		Solve for a and b, such that there are an infinite number of solutions.

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Simultaneous Equations Quiz

by Human_Calculator

Created May 9, 2010 in Science
Game Plays 61

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	WyvernSabres:	May 10th, 2010 at 22:11 GMT		2 points
	Q3 says solve for x and y. So I did. Then presumed you wanted z too: why not say so? Q4 should accept unsolvable: because I didn't know what wording you wanted I didn't even get to Q5.

	Human_Calculator:	May 28th, 2010 at 02:42 GMT		0 points
	How astute of you: good advice to proceed towards my 2nd quiz. The Quiz's Author, Human_Calculator

	sten:	Mar 22nd, 2011 at 19:44 GMT		1 point
	I like the premise (and the linalg shoutout in the last question). I think it'd help to note the expected format of the answer (number, number)—I got frustrated trying variations on x=_, y=_ before I found it. Agreed with WyvernSabres on Q4, too; it'd be great if you accepted a few different answers there. :]