Question

3 poir
11) Find the solution the
following pair of Linear
equations by the substitution
method : 7x + 2y = 20 and x +
2y = 8​

Answer 1

Answer:

7x + 2y = 20.........................1

x + 2y = 8...........................2

now subtracting equation 2 from equation 1

7x + 2y = 20

x + 2y = 8

- - -

----------------

6x = 12

x = 6

now put x =6 in equation 2

x + 2y = 8

6 + 2y = 8

2y = 8 - 6

2y = 2

y =1

so, x = 6

y = 1

Answer 2

Step-by-step explanation:

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