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lawyer [7]
3 years ago
6

Which pair of equations represents perpendicular lines?

Mathematics
1 answer:
OLEGan [10]3 years ago
3 0
The\ slope-intercept\ form:y=mx+b\\\\k:y=m_1x+b_1\ and\ l:y=m_2x+b_2\\\\k\perp l\iff m_1\cdot m_2=-1\Rightarrow m_2=-\frac{1}{m_1}\\-----------------------\\therefore\\a)\ m_1=\frac{1}{2};\ m_2=-\frac{1}{2}\ \boxed{NOT\ :(}\\\\b)\ m_1=5;\ m_2=-\frac{1}{5}\ \boxed{YES\ :)}\ \ 5\cdot(-\frac{1}{5})=-1\\\\c)\ m_1=\frac{1}{5};\ m_2=\frac{1}{5}\ \boxed{NOT\ :(}\\\\d)\ m_1=3;\ m_2=6\ \boxed{NOT\ :(}
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seropon [69]

Step-by-step explanation:

Use Eucild division lemma to help solve this.

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d1i1m1o1n [39]

Answer:

The fraction of chores which Janie wants to earn enough money to buy a CD for $13.50 are 8.75~9 chores

Step-by-step explanation:

Given that Janie has $3. She earns $1.20 for each chore she does and can do fractions of chores. She wants to earn enough money to buy a CD for $13.50.

we have to find the fraction of chores Janie did to earn total of $13.50

Let the fraction of chores is x which Janie wants to earn enough money to buy a CD for $13.50.

Total money=$3+$1.20(fraction of chores)

$13.50=$3+$1.20(x)

$13.50-$3=$1.20(x)

x=8.75~9

Hence, the fraction of chores which Janie wants to earn enough money to buy a CD for $13.50 are 8.75~9 chores

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3 years ago
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