exam Maths Puzzle Numerical Ability

x^2-11xy-42y^2

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I need help hope you can on this one....Please help me :)
Page 173 Number 28

number line starts at --5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 x

Now I have to translate the g
Find the slope of 2, -2, 1/2 and -1/2