SOLUTION: dear tutors, plz help me find the value of a and b so that x/a + y/b =1 passes through (3,-2) and (9,2). I've already tried answering it but i dont know how.. i solved the value

Question 48025: dear tutors, plz help me find the value of a and b so that x/a + y/b =1 passes through (3,-2) and (9,2).
I've already tried answering it but i dont know how..
i solved the value of x and y..
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!

(3,-2) -->
--> now multiply all terms by ab

(9,2) -->
--> now multiply all terms by ab, again

Now we have
3b - 2a = ab and
9b + 2a = ab

Lets add them:
12b = 2ab
2a = 12
--> a = 6

Now, gives 9b + 12 = 6b
3b = -12
b = -4

So we have

CHECK: use (3,-2):

is 1... correct

CHECK: use (9,2)

is 1... correct

jon

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