book Maths Puzzle Numerical Ability

I need to find the intercept point of y=3x+8 and 4x+2y=6. If you can find the answer, would you explain it to me? I also have a few more to do and I need to understand how to do it.

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book Other Question

If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the original square?


Thank you.
a box contain 6 choclates,the mass of the box &choclate is 200 gm.Find the mass of one choclate.Determine the mass of the box.Let B grams represent the mass of a box containing N c