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Furkat [3]
3 years ago
6

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

Mathematics
2 answers:
Dimas [21]3 years ago
6 0

Answer:

Step-by-step explanation:

1)  2x + y =7 -------------(I)

   x - y = 2   -----------(II)

2x + y = 7

<u> x - y = 2 </u>   {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

san4es73 [151]3 years ago
5 0

Answer:

one ×=y-7/2

two y=x-2

number 2 3

I didn't find any decimals

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