exam Maths Puzzle Numerical Ability

2x+y=6 and 1/2x+1/4y=1 and 1/3x-1/2=3 and -2x+y=4 I am having so much problems with these kinds of problems. please help.

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exam Other Question

twice the greater of two consecutive odd integers is 13 less than three times the lesser. find the number

define a variable
write equation
solve

can you show me how to do this problem please?
Samuel invested a portion of $15,000 in a savings account paying 5 percent annual interest and the reaminder in a time deposit paying 7 percent. If his annual interest from the ti