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3 years ago

Please I need help thank you in advance

Mathematics

2 answers:

arlik [135]3 years ago

7 0

Answer: The amswer is D because -1 + 1 = 0

astra-53 [7]3 years ago

6 0

Answer: d is correct

Step-by-step explanation: can I have brainliest

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Use Cramer's Rule to solve the following system: –2x – 6y = –26 5x + 2y = 13

andriy [413]

$\bf \begin{cases}
-2x-6y&=-26\\
\quad 5x+2y&=13
\end{cases}\stackrel{\textit{determinant of the coefficients}}{D=
\begin{bmatrix}
-2&-6\\5&2
\end{bmatrix}}\implies (-4)-(-30)
\\\\\\
D=-4+30\implies \boxed{D=26}\\\\
-------------------------------\\\\$

$\bf x=\cfrac{D_x}{D}\implies x=\cfrac{
\begin{bmatrix}
\boxed{-26}&-6\\\\ \boxed{13}&2
\end{bmatrix}}{D}\implies x=\cfrac{(-52)-(-78)}{26}
\\\\\\
x=\cfrac{-52+78}{26}\implies x=\cfrac{26}{26}\implies \boxed{x=1}\\\\
-------------------------------\\\\
y=\cfrac{D_y}{D}\implies y=\cfrac{
\begin{bmatrix}
-2&\boxed{-26}\\\\ 5&\boxed{13}
\end{bmatrix}}{D}\implies y=\cfrac{(-26)-(-130)}{26}
\\\\\\
y=\cfrac{-26+130}{26}\implies y=\cfrac{104}{26}\implies \boxed{y=4}$

4 0

3 years ago

Which two are equivalent?

never [62]

Answer:

Expression I and IV

Step-by-step explanation:

Expression I simplified :

3n + 7 + n + 4n
8n + 7
Expression I = Expression IV

7 0

2 years ago

Find the cost of 20cm at 75 per m

zheka24 [161]

Answer:

20cm = 0.2 m

The cost

= 0.2 x 75

= $15

7 0

2 years ago

Read 2 more answers

Heather drew the scaled drawing of a train car shown below. She used the scale of 2 cm = 5 ft to complete the

lora16 [44]

Answer: c

Step-by-step explanation:

3 0

3 years ago

I will give BRAINIEST

Lilit [14]

I believe it’s c/100.
2=20
10 divided by 2 = 5.
Multiply 5 by 20. That equals 100.

4 0

2 years ago

Please I need help thank you in advance ​

Please I need help thank you in advance