Question 265632
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If your equation is in the form *[tex \Large y\ =\ mx\ +\ b], then the slope is the coefficient on *[tex \Large x].  If the slope must be -1, then *[tex \Large 2a] must equal -1, so solve


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2a\ =\ -1]


for *[tex \Large a]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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