exam Maths Puzzle Numerical Ability

please help

Use substitution to solve for x and y

3x - y = 3

y = 2x - 1

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exam Other Question

I need help in answering,what is [x+y4] for x =4 and y = 8 the answer I got was 3 is that right. the 4 belongs under the x+y 8z-7=3z-7+5z