exam Maths Puzzle Numerical Ability

Can not figure this one out?


Solve the system by addition or substitution.
3x - 4y = 8
6x - 2y = 10

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May someone help me translate into an algebraic expression. Thanks

"Twice the difference of a number and one added to triple the number yields twenty less than six times the number." I need to create a word problem for the following matrix, can you help:


1 1 1 [x] = [100]
5 -3 0 [y] = 10
0 3 4 [z] = 290


x + y + z = 100
5x + -3y = 10
3y + 4z