3 years ago

Help please I will give you the brainliest

Mathematics

1 answer:

Svetllana [295]3 years ago

5 0

Answer:

1.5x=6

x=4

Step-by-step explanation:

Area of a rectangle is length*width

so 1.5*x = area and the area is 6

Solve for x

1.5*x=6

x=6/1.5

x=4

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Solve for xxx. Give an exact answer. 0.5(5−7x)=8−(4x+6)

bearhunter [10]

Answer:

x=-1

Step-by-step explanation:

0.5(5−7x)=8−(4x+6)

I do not like working with fractions so I will multiply by 2 on each side

2*0.5(5−7x)=2*8−2(4x+6)

5 -7x = 16 -2( 4x+6)

Distribute

5-7x = 16 -8x -12

Combine like terms

5-7x =4-8x

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5 -7x+8x = 4-8x+8x

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Subtract 5 from each side

5-5+x = 4-5

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HELP!! Subtract: (2x3 + 7x2 – 4) – (22x2 + 4x – 10)

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Step-by-step explanation:

2x3+5x2-4x+6 is your answer

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3 years ago

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Using Cramer’s Rule, what is the value of x in the system of linear equations below?

MArishka [77]

We have to solve the system of equations by Cramer's rule.

The coefficient matrix is given by

$D=\begin{bmatrix}3&4\\8 &-2\end{bmatrix}$

Let us find the determinant of coefficient matrix.

$|D|= -6-32=-38$

For X-matrix

$D_x=\begin{bmatrix}15&4\\40 & -2\end{bmatrix}$

Now, we find its determinant

$|D_x|=-30-160=-190$

For Y-matrix

$D_x=\begin{bmatrix}15&3\\ 40&8\end{bmatrix}$

Now, we find its determinant

$|D_y|=120-120=0$

Therefore, the value for x is given by

$x=\frac{D_x}{D}\\\\x=\frac{-190}{-38}\\\\x=5$

The value for x is 5.

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Step-by-step explanation:

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