Fl4sh 30 Report post Posted December 5, 2010 I was doing some elementary type problems in a book I'm reading:"Give the slope and y-intercept for each equation and the number of solutions for the system:1. x + y = 7"This is the answer:"1. m1 = –1, b1 = 7, m2 = 1/3, b2 = 2/3; one solution"I got slope and y-int (-1 and 7) but where did the other slope and y intercept come from? And also, how do you get the solution with only one system? ;oPerhaps I'm reading the book wrong...let me know. 0 Share this post Link to post Share on other sites
grhodes_at_work 1385 Report post Posted December 5, 2010 Well this is clearly out of a textbook of some sort, and is not on topic, so I'm going to answer assuming it is a homework problem. That is, I won't give you an answer, and I will ask other folks also to not give answers, only clues and hints.That said, I would suggest that you do a simple test to check and see if both of the solutions are valid. You have all the information you need. I encourage you to show your test here! 0 Share this post Link to post Share on other sites
Fl4sh 30 Report post Posted December 6, 2010 It's actually not a homework problem...lol.I was going through a math and physics book by wendy jones, they have self assessments at the end of each section. 0 Share this post Link to post Share on other sites
Aken H Bosch 348 Report post Posted December 6, 2010 Well, it's a system-of-linear-equations problem, so there should be another equation (probably on the next line) 0 Share this post Link to post Share on other sites
DalexL 100 Report post Posted December 7, 2010 x + y = 7 ?x = anythingy = 7 - x 0 Share this post Link to post Share on other sites
Emergent 982 Report post Posted December 7, 2010 The full question must have been,Quote:Give the slope and y-intercept for each equation and the number of solutions for the system:1. x + y = 72. -x + 3 y = 2For bonus points, figure out what the solution is (i.e., where these two lines intersect). 0 Share this post Link to post Share on other sites