Deepak Suwalka
Deepak Suwalka answered

2pens + 3 pencils = 86.....(1)

4pens + pencil = 112..........(2)

Multiply equ(1) by 2

4pens + 6pencils = 172.....(3)

Now subtract eq(3) from eq(2)

      4pens + pencil = 112

    -4pens - 6pencils = -172

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        0    - 5pencils = -60

pencils = -60/-5 = 12

Put the cost of a pencil in eq(2)

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Deepak Suwalka
Deepak Suwalka answered

The fraction in wich denominator is two times the numerator is equivalent to 1/2

Here, denominator (12) isn't two times the numerator (7)

7×2 = 14 ⇒  12 ≠ 14

So 1/2 Is not equivalent to 7/12

Deepak Suwalka
Deepak Suwalka answered Allison Lee's question

5(x + y) = 10x+y - 13.......(1)

4(x + y) = 10y+x - 21.........(2)

After solving it you will get the value of x=9 and y=8

For checking put the values in the equations

4(9 + 8) = 80+9 - 21

4(17) = 89-21

68 = 68

I hope it'll help.