# Very simple math thing... o

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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
"

"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? ;o

Perhaps I'm reading the book wrong...let me know.

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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!

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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.

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Well, it's a system-of-linear-equations problem, so there should be another equation (probably on the next line)

x + y = 7 ?

x = anything

y = 7 - x

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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 = 2

For bonus points, figure out what the solution is (i.e., where these two lines intersect).

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