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May 27, 2015

Homework Help: math,correction

Posted by Jasmine20 on Friday, January 26, 2007 at 12:40pm.

Find four solutions for the equation
3x+5y=15


so the equation will turn to be
y=-(3)/(5)x+ (3)

and when i do the table i get these points for the solution

(-2,4.2),(-1,3.60),(0,3),(1,1.8)

ok

Let me give you a help.

Take the slope, denominator. 5. Now make each x an multiple of 5, say 0,5, 10, 15, -5
It makes it so easy to multiply in your head.

Find four solutions for the equation
3x+5y=15

Assuming you are seeking integer answers:

Dividing through by 3 yields x + y + 2y/3 = 5

2y/2 must be an integer as does y/3 so y/3 = k making y = 3k.

Substituting, 3x + 15k = 15 making x 5 - 5k

k.....0.....1.....2.....3
x.....5.....0....-5....-10
y.....0.....3.....6.....9

The only positive solutions exist between (5,0) and (0,3)on the line defined by y = (15 - 3x)/5

There are no integer solutions between these two points but there are an infinite number of rational solutions.

x.....0.....1.....2.....3.....4.....5
y.....5....2.4...1.8...1.2....6.....0

x....5....3.33..1.66...0
y....o.....1.....2.....3

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