Question

7x-3y=31, 9x-5y=4 solve by elimination method​

Answer 1

Step-by-step explanation:

putting y=3 we get x as 7x-3×3=31, x=40/7 , similarly you can do other questions also

Answer 2

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Given Equations:

7x - 3y = 31 _____ i

9x - 5y = 4 _____ ii

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To Find:

The value of x and y by using elimination method.

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Explanation:

Multiply both the sides of eq.(i) by -5, we obtain

-35x + 15y = -155 _____ iii

Multiply both the sides of eq.(ii) by 3, we obtain

27x - 15y = 12 _____ iv

Add eq.(iii) with eq.(iv), we obtain

-8x = -143

or, x = 143/8

Now substitute the value of x in eq.(i), we obtain

7 ( 143/8 ) - 3y = 31

or, y = 251/8

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Answer:

The value of x and y is 143/8 and 251/8 respectively.

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