Question

-7x+4y=18
3x+7y=1
value of x,y
elemination method

Answer 1

Step-by-step explanation:

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Answer 2

ANSWER:

• Value of'x' is (-2) and 'y' is 1

GIVEN:

• -7x+4y= 18
• 3x+7y = 1

TO FIND:

• Value of 'x'and'y'.

SOLUTION:

=> -7x+4y = 18. ......(I)

Muntiplying both sides by 3 we get;

=> 3(-7x+4y) = 18(3)

=> -21x+12y = 54. ...(ii)

=> 3x+7y = 1

Muntiplying both sides by 7 we get;

=> 7(3x+7y) = 1*7

=> 21x+49y = 7. .......(iii)

Adding eq (iI) and (iii) we get;

=> -21x+12y+21x+49y = 54+7

=> 61y = 61

=> y = 61/61

=> y = 1

Putting y = 1 in eq(i) we get;

=> -7x+4(1) = 18

=> (-7x) = 18-4

=> x = 14/-7

=> x = (-2)

Value of'x' is (-2) and 'y' is 1