Book Maths Puzzle Algebra

can you please send me some practice work on algebra? i'm having problem with problem like 2x + 4y= 8

6x + 12y= 24



Then it would ask question like, what is the value of Y? I do run into problem like 3x + 4y= 12, and 6x + 14y= 30, so what is the y + 10=



can you email how do problem like this

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Book Other Question
Two tanks contain equal amounts of water. They are connected by a pipe and 3000 litres of water is pumped from one tank to the other. One tank then contains 6 times as much water a The product of three consecutive integers is 22 less than the cube of the middle integer. Find the integers.