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nydimaria [60]
3 years ago
7

Helppppp please i tont get these answers will get brainly i swear

Mathematics
1 answer:
Marrrta [24]3 years ago
5 0

Answer:15-A

Step-by-step explanation:

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Use elimination to solve and match each system of equations to the correct solution.
podryga [215]

\begin{cases}2x-9y=-51\\2x-3y=-9\end{cases}\\\\\\\begin{cases}(2x-9y)(-1)=-51(-1)\\2x-3y=-9\end{cases}

\begin{cases}-2x+9y=51\\2x-3y=-9\end{cases}     (adding the second equation to the first one)

\begin{cases}\qquad6y=42\\2x-3y=-9\end{cases}\\\\\\\begin{cases}\qquad y=7\\2x-3y=-9\end{cases}\\\\\\\begin{cases}y=7\\2x-3(7)=-9\end{cases}\\\\\\\begin{cases}y=7\\2x-21=-9\end{cases}\\\\\\\begin{cases}y=7\\2x=12\end{cases}\\\\\\\begin{cases}x=6\\y=7\end{cases}

7 0
3 years ago
Two construction workers, Tyrone and Diego, are standing 15 yards apart, looking up at a piano hanging between the two men from
Yanka [14]

Answer:

The distance between Tyrone and the piano is 23.7 yards

Step-by-step explanation:

see the attached figure to better understand the problem

step 1

Find the measure of angle P

Remember that the sum of the internal angles of a triangle must be equal to 180 degrees

∠T+∠D+∠P=180°

substitute the given values

65°+77°+∠P=180°

142°+∠P=180°

∠P=180°-142°=38°

step 2

applying the law of sines

\frac{TD}{sin(P)}=\frac{TP}{sin(D)}

substitute the given values

\frac{15}{sin(38\°)}=\frac{TP}{sin(77\°)}

TP=\frac{15}{sin(38\°)}(sin(77\°))\\\\TP=23.7\ yd

therefore

The distance between Tyrone and the piano is 23.7 yards

6 0
3 years ago
What is the discriminant of 9х2 + 2 = 10x?
vredina [299]

\bf 9x^2+2=10x\implies 9x^2-10x+2=0 \\\\[-0.35em] ~\dotfill\\\\ \qquad \qquad \qquad \textit{discriminant of a quadratic} \\\\\\ \stackrel{\stackrel{a}{\downarrow }}{9}x^2\stackrel{\stackrel{b}{\downarrow }}{-10}x\stackrel{\stackrel{c}{\downarrow }}{+2}=0 ~~~~~~~~ \stackrel{discriminant}{b^2-4ac}= \begin{cases} 0&\textit{one solution}\\ positive&\textit{two solutions}~~\checkmark\\ negative&\textit{no solution} \end{cases} \\\\\\ (-10)^2-4(9)(2)\implies 100-72\implies 28

5 0
3 years ago
The graph shows the relationship between James’s resting heart rate and the number of hours he exercises per day. For every hour
sweet-ann [11.9K]

Answer:

dude im in 8th grade and im getting college math no wonder i have a D-

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Y=-3/2x+2 Help please!
skad [1K]
 I believe this is the correct answer Y= 3/2x+2
 Hope this helped you and have a fantastic day!
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3 years ago
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