$\left \{ {{y=-2x+1} \atop {4x+2y=-1}} \right.\\\\ \left \{ {{y=-2x+1} \atop {4x+2(-2x+1)=-1}} \right\\\\ \left \{ {{y=-2x+1} \atop {4x-4x+2=-1}} \right. \\\\ \left \{ {{y=-2x+1} \atop {2=-1}} \right. .$

=> no solution

Step-by-step explanation:

4 0

3 years ago

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A deck of cards contains 10 black cards and 10 red cards. The first card drawn is not replaced before drawing the second card. W

Virty [35]

<h3>Answer: 9/38</h3>

Reason:

There are 10 red cards out of 10+10 = 20 total.

10/20 = 1/2 is the probability of selecting a red card.

If the red card is not put back (i.e. "no replacement"), then the chances of getting another red card is (10-1)/(20-1) = 9/19

Multiply the two fractions mentioned to get the final answer.

(1/2)*(9/19) = (1*9)/(2*19) = 9/38

3 0

2 years ago

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