Use the number line below to show that `-3-(-9) = 6`. (2 marks)
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`text(Remember:)\ -\- = +`
`text(Therefore:)\ -3- -9 = -3 + 9`
`:.\ text(Start at)\ -3\ text(and count 9 units in the positive direction.)`
`text(Finish point is at)\ + 6.`