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You drive $600$ miles in $2$ days. You drive $120$ miles less than you did on day one than on day $2$. How many miles did you drive both days separately? Solve algebraically.

$$d_1+d_2=600$$
$$d_2=d_1-120$$
Where do I go from here?

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    Try replacing your second equation for d2 into the first one...2011-04-17
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    Okay, so d1+d1-120=600?2011-04-17
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    So then, d1+d1=480. d1=240. But 240-120= 120, and 120+240 is not equal to 600.2011-04-17
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    $d_1 + d_1 - 120 = 600$ is correct, but you must *add* $120$ to each side, giving you $d_1 + d_1 = 720$, which should give you the right answer.2011-04-17
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    Neal, the problem is that you made a mistake, you should get $720$ instead of $480$ because you're adding $600 + 120$ not subtracting.2011-04-17

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