Question

Solve for x and y 3/x+4y=7, -2/x+7y=5

Answer 1

3/x+4y=7____(1)

-2/x+7y=5___(2)

multiple eq. (1) by 2 , eq. (2) by 3 and the add them.

6/x + 8y = 14

+

-6/x +21y = 15

__________________

0 + 29y = 29

y=29/29

____________

| y = 1. |

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put y =1 in eq. no. (1)

3 + 4 × 1 =7

x

3 + 4 = 7

x

3 + 4x = 7

x

3 + 4x = 7x

7x - 4x = 3

3x= 3

_______

| x = 1 |

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