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3 years ago

Solve by substitution

1 answer:

3 0

In second equation add 0.74 and y to both sides: 3.25x+0.74=y;
Substitute y in the first equation: -4.5x-2(3.25x+0.74)=-12.5;
Distribute multiplication over addition:
-4.5x-6.50x -1.48=-12.5;
Combine like terms and add 1.48 to both sides:
-11x= -12.5+1.48;
-11x= 11.02 divide both sides by -11;
X= -11.02/11= -1.00(18)
Y= 3.25• -1.00(18)+.74= -2.515(90)

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Evaluate \dfrac {15}k

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Answer:

Step-by-step explanation:

We desire to evaluate the fraction: $\dfrac{15}{k}$ when k=3.

This is a simple substitution, so what is required is

Replace k with the given number
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$\dfrac{15}{k}=\dfrac{15}{3}=5$

You can try the same for any value of k.

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3 years ago

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3 years ago

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valkas [14]

Answer:

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3 years ago

Translate in an equation but do not solve.<br>sixty-eight is twelve less than x

belka [17]

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If 68 is 12 less than x, then we should add 12 to 68 to get x.

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3 years ago

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konstantin123 [22]

Answer:

$\frac{1}{8}$ or $\frac{9}{78}$

(see explanation)

Step-by-step explanation:

This problem is asking about compound probability, what is the probability of this even happening three times in a row.

Since there are 20 boy's names and 20 girl's names in the hat, one can say that half of the names in the hat. Assume that after drawing it from the hat, the name is put back into the hat. Therefore, on each night, there is a half-chance of the event happening. To find the probability of the event, one must multiply ( $\frac{1}{2}$ ) by itself (3) times,

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$(\frac{1}{2})(\frac{19}{39})(\frac{9}{19})$

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3 years ago