- Thread starter Stine
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- Feb 20, 2005

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1/2 x - 3/5 y =2 to clear fractions multiply both sides by 10

5x -6y=20

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eq2)

4/5 x 9/2 y =3/10 multiply both sides by 10

8x+45y=3

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solve 2 equations in 2 unknowns

5x-6y=20

8x+45y=3

I will solve this by one method but you use the technique you are being taught

multiply first equation by 15, and second by 2

75x-90y=300

16x+90y=6

add the equations

91x=306

x = 91/306

factors 91 = 1,7,13 none are factors of 306 except 1

x=91/306 answer can't be reduced

to find y multiply first equation by -8 and second by 5

-40x+48y=-160

40x+225y=15

add equations

273y=-145

y=-145/273

factors of 145=1,5,29none of which are factors of 273

y=-145/273 answer

Arthur

Stine said:> 1/2x-3/5y=2

> 4/5x+9/2y=3/10

Much easier if you rewrite such equations this way:

x / 2 - 3y / 5 = 2

4x / 5 + 9y / 2 = 3 / 10

> 1/2x-3/5y=2+3/5y/1/2x =4+3/5y=2-4

No idea what you're trying to do;

you have to COMBINE the 2 equations in order to solve :shock:

- Joined
- Feb 20, 2005

- Messages
- 854

Arthur

- Joined
- Feb 20, 2005

- Messages
- 854

let the total be 129.6 pineapples,then you can have the fourth man take 1/4 of the total

man no...........amount taken..........amount left

1,,,,,,,,,,,,,,,,,,,,,,,,,43.2,,,,,,,,,,,,,,,,,,,,,,, 86.4

2,,,,,,,,,,,,,,,,,,,,,,,,28.8,,,,,,,,,,,,,,,,,,,,,,,,,,57.6

3,,,,,,,,,,,,,,,,,,,,,,,19.2,,,,,,,,,,,,,,,,,,,,,,,,,,,38.4

4,,,,,,,,,,,,,,,,,,,,,,,, 32.4,,,,,,,,,,,,,,,,,,,,,,,,,,,6

Arthur