book Maths Puzzle Numerical Ability

can you please help me with this question?

y-(y+3)=y+6

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book Other Question

A line in the Cartesian plane passes through the points (1,3) and (5, 4). What is the slope of the line? Hello again. Once again I would like to verify my work. Could a tutor please show me the solution to the below problem. In advance, thank you.

Graph the hyperbola whose equ