Question

1)if the equations 2x +y=7 and x-y= 2 are solved simultaneously, then y =

Answer 1

Answer:

Step-by-step explanation:

1)  2x + y =7 -------------(I)

   x - y = 2   -----------(II)

2x + y = 7

x - y = 2   {Now add both the equations. 'y will be cancelled}

3x     = 9

      x = 9/3

      x = 3

Plugin x = 3 in equation (I)

 2*3 + y = 7

     6+ y = 7

            y = 7 - 6 = 1

Answer: a) y = 1

2) Prime factorize 12 , 15 and 18

12 = 2 * 2 * 3

15 = 3 * 5

18 =  2 * 3 * 3

HCF = 3

e) 3

Answer 2

Answer:

one ×=y-7/2

two y=x-2

number 2 3

I didn't find any decimals