Question

solve the following sets of simultaneous equation.

2r - 7у - 7; 3х + у
: 22

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Answer 1

Answer:

2x - 7y = 7 .....(I)

3x + y = 22 .....(II)

Multiply (II) with 7

21x + 7y = 154 .....(III)

(I) + (III)

23x = 161

x = 7

And put x=7 in any equation to find the value of y

y=1

x=7,y=1

Answer 2

( x =6.70, y= 0.91)

Step-by-step explanation:

2x- 7y=7........eq 1

3x+ y=22.........eq 2

Multiply eq 2 by 7

We get,

21x + 7y=154.....eq 3

Now ,

Adding eq 1 &eq 3....

We get ,

2x -7y = 7

+ 21x +7y = 154

______________

24x = 161

:. x = 161÷24

:. x = 6.70

Put x=6.70 in eq 1

we get,

2x - 7y = 7

2 × 6.70 - 7y = 7

:. 13.4 - 7y = 7

:. -7y = 7 - 13.4

:. -7 y = -6.4

:. 7y = 6.4

: . y = 0.91

Solution ( x =6.70, y= 0.91)