exam Maths Puzzle Numerical Ability

If a function rule is 2x - 3 what is the output for 3?

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exam Other Question

Graph the following; calculate the slope, x-intercept and y-intercept and label the intercepts on a graph.
4.2x+3.8y=1.9

Thanks! Difference of two numbers is 14. The second is less that 2 times the first. What are two numbers?
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> I found a way for this to be both -13 and -27, or 15 and 29. Which is correct?