1)if the equations 2x +y=7 and x-y= 2 are solved simultaneously, then y =
(a)1 (b)-2 (c)-1 (d)+2 (e)3

2)Find the H.C.F of 12, 15 and 18.
(a) 2 (b)6 (c) 4 (d)5 (e)3

3)Express 100011two as a decimal number.
(a) 32 (b) 33 (c) 34 (d) 35 (e) 36​

Respuesta :

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:

one ×=y-7/2

two y=x-2

number 2 3

I didn't find any decimals

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