algebra 1

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If the graph of a line has a positive slope and a negative y-intercept, what happens to the x-intercept if the slope and y-intercept are doubled?

A) The x-intercept becomes 4 times larger
B) The x-intercept becomes twice as large
C) The x-intercept becomes 1/4th as large
D) The x-intercept remains the same

I need the answer, but also how I would figure this out myself. Thanks!

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