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dem82 [27]
2 years ago
11

Solve and check please please help i will mark u as a brill it is easy please

Mathematics
2 answers:
Lesechka [4]2 years ago
5 0

Answer:

B=25

Step-by-step explanation:

marysya [2.9K]2 years ago
4 0
Subtract 25 on both sides to get b alone and you get b=25!
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Solve the system by using a matrix equation (Picture provided)
Katyanochek1 [597]

Answer:

Option b is correct (8,13).

Step-by-step explanation:

7x - 4y = 4

10x - 6y =2

it can be represented in matrix form as\left[\begin{array}{cc}7&-4\\10&-6\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}4\\2\end{array}\right]

A= \left[\begin{array}{cc}7&-4\\10&-6\end{array}\right]

X= \left[\begin{array}{c}x\\y\end{array}\right]

B= \left[\begin{array}{c}4\\2\end{array}\right]

i.e, AX=B

or X= A⁻¹ B

A⁻¹ = 1/|A| * Adj A

determinant of A = |A|= (7*-6) - (-4*10)

                                    = (-42)-(-40)

                                    = (-42) + 40 = -2

so, |A| = -2

Adj A=  \left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]

A⁻¹ =  \left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]/ -2

A⁻¹ =  \left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right]

X= A⁻¹ B

X=  \left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right] *\left[\begin{array}{c}4\\2\end{array}\right]

X= \left[\begin{array}{c}(3*4) + (-2*2)\\(5*4) + (-7/2*2)\end{array}\right]

X= \left[\begin{array}{c}12-4\\20-7\end{array}\right]

X= \left[\begin{array}{c}8\\13\end{array}\right]

x= 8, y= 13

solution set= (8,13).

Option b is correct.

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How many terms are in the expression? 2x + 4y - 3 A) -3 B) 2 C) 3 D) 4
iragen [17]

Answer:

there are 3 terms no.C)

6 0
3 years ago
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Solve each equation and check.show all work. ​
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Answer:

-b=11

Step-by-step explanation:

Nothing else is equal to a number except its self

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PLEASE HELP ASAP I WILL GIVE BRAINLIESS NO GUESSING!!!
tino4ka555 [31]

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7

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Step-by-step explanation:

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If Charlie liked dogs, and Macy's hat was green, how fast was the car, that the dog's dad was driving?
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