How to solve this task 4×-2+1=3×+5

Mathematics

1 answer:

just olya [345]3 years ago

8 0

4x-2+1=3x+5

Subtract 3x from both sides

x-2+1=5

Same as

x-1=5

Add 1 to both sides

x=6

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A rectangular garden has length and width as given by the expressions below.

Helen [10]

2[4 − 7(3x + 4y)] + 2[3x(−2y)]
2[4 - 21x -28y] + 2[-6xy]
8 - 42x - 56y -12xy

the perimeter of given rectangular garden is (8 - 42x - 56y -12xy).

4 0

3 years ago

M is between points C and Q. CM=17 and CQ=21. What is MQ?

timurjin [86]

The answer is 21 - 17, which = 4.
Or you could +4 to CM (17) which equals CQ (21)

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3 years ago

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using Cramers rule , what is the value of x in the system of linear equations below? -1/2x+3y=-4 -x-y=-1

Tatiana [17]

Cramer's rule tells you that the value of x in the system of equations

$ax+by=c\\dx+ey=f$

is given by

$x=\dfrac{ce-fb}{ae-bd}$

In matrix terms, this is the determinant of the coefficient matrix with the right-side constants replacing the x-coefficients divided by the determinant of the matrix of coefficients. The value of y can be found by doing similar math with the numerator being the determinant of the coefficient matrix with the right-side constants replacing the y-coefficients. For systems of higher dimension, the column of right-side coefficients replaces each column of variable coefficients in turn.

For your equations, this evaluates to

$x=\dfrac{(-4)\cdot (-1)-(-1)\cdot 3}{\frac{-1}{2}\cdot (-1)-(-1)\cdot 3}=\dfrac{7}{\left(\frac{7}{2}\right)}\\\\x=2$