Question

find value of X and y in 3x-7y=-10 and y-2x-3=0​

Answer 1

ANSWER:

• Value of x is (-1) and y is 1.

GIVEN:

• 3x-7y = -10
• y-2x -3 = 0

TO FIND:

• Value of 'x' and 'y'.

SOLUTION:

1st equation:

=> 3x-7y = -10 ....(i)

2nd equation :

=> y-2x = 3

Muntiplying both sides by 7

=> 7y-14x = 21 ....(ii)

Adding eq (i) and (ii) we get;

=> 3x-14x = -10+21

=> -11x = 11

=> x = (-1)

Putting x = (-1) in eq(i)

=> 3(-1)-7y = -10

=> -3-7y = -10

=> -7y = -10+3

=> y = -7/-7

=> y = 1

Value of x is (-1) and y is 1.

Answer 2

Answer:

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QUESTION :

Find value of X and y in 3x-7y + 10 = 0 and y-2x-3=0

SOLUTION :

To find the value of x and y, we should use substitution method..

Let,

☛ 3x - 7y + 10 = 0 .......... (1)

☛ y - 2x - 3 = 0 .......... (2)

We can write the equation (2) as,

★ y = 2x + 3 .......... (3)

• Substitute the value of the equation (3) in equation (1)

➡ 3x - 7( 2x + 3 ) + 10 = 0

➡ 3x - 14x - 21 + 10 = 0

➡ - 11x - 11 = 0

➡ - 11x = 0 + 11

➡ - 11x = 11

➡ x = 11 / (-11)

➡ x = - 1

➢ Now we have got the value of x.

• Substitute the value of x in the equation (3) to get the value of y.

➡ y = 2(-1) + 3

➡ y = -2 + 3

➡ y = 1

• CHECKING.....

To check whether the values are correct are not... substitute the values of x & y in any equation.

➙ 3x - 7y = - 10

• LHS = RHS

→ LHS = 3x - 7y ; RHS = - 10

➙ 3(-1) - 7(1)

➙ - 3 - 7

➙ -10

HENCE, THE VALUES OF x = -1 & y = 1

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Step-by-step explanation:

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