Question

SOLVE ........

2x + 6y = 10; 6x + 2y = 70

x+y = ❓

own question .....xD​

Answer 1

Step-by-step explanation:

Complete the following activity to solve the simultaneous equations.

5x + 3y = 9 -----(I)

2x + 3y = 12 ----- (II)

ANSWER:

Disclaimer: There is error in the Q. In (II) there should have been 2x - 3y = 12

5x + 3y = 9 -----(I)

2x - 3y = 12 ----- (II)

Add (I) and (II)

7x = 21

x = 3

Putting the value of x = 3 in (I) we get

5(3)+3y=9⇒15+3y=9⇒3y=9-15=-6⇒y=-2

Thus, (x, y) = (3, -6).

you can easily find the answer though the attachment.

Answer 2

Step-by-step explanation:

Here,

2x + 6y =10

2x = 10 - 6y

x = ( 10 - 6y)/2 .......1st equation

6x + 2y = 70 ........2nd equation,

Substituting the value of X in 2nd equation

6( 10 - 6y)/2 + 2y = 70

(60 -36y + 4y)/2 = 70

( 60 - 32y ) = 140

-32y = 140 -60

-32y = 80

y= -2.5

Also,

6x + 5 = 70

6x = 65

x= 10.8