7 + y/2= -3. This is two step equation

Mathematics

2 answers:

Afina-wow [57]3 years ago

8 0

Answer:

y = -20

Step-by-step explanation:

7 + $\frac{y}{2}$ = -3

The first step is to isolate the variable by subtracting 7 from both sides:

$\frac{y}{2}$ = -10

Then, to get rid of the *divided by 2*, multiply both sides by 2:

y = -20

Bezzdna [24]3 years ago

5 0

First subtract 7 from both side
7+y/2=-3
-7. -7
And them multiple de two from both side
2.y/2=-10.2
And the answer is 20

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Use a matrix to solve the system:

Romashka-Z-Leto [24]

Answer:

(2.83 , 1 , 4)

Step-by-step explanation:

$2x+2y-z=4\\4x-2y-2z=2\\3x+3y-4z=-4\\$

Rewrite these equations in matrix form

$\left[\begin{array}{ccc}2&2&-1\\4&-2&-2\\3&3&-4\end{array}\right] \left[\begin{array}{ccc}x\\y\\z\end{array}\right]=\left[\begin{array}{ccc}4\\2\\-4\end{array}\right] \\$

we can write it like this,

$AX=B\\X=A^{-1}B$

so to solve it we need to take the inverse of the 3 x 3 matrix A then multiply it by B.

We get the inverse of matrix A,

$A^{-1}=\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right] \\$

now multiply the matrix with B

$X=A^{-1}B\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right]\left[\begin{array}{ccc}4\\2\\-4\end{array}\right] \\\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}2.83\\1\\4\end{array}\right] \\$

4 0

3 years ago

Last problem!! I think so far

slega [8]

The answer is A I believe.

3 0

3 years ago

Read 2 more answers

In 3-10 use the distributive property to find each missing factor

Elanso [62]

The missing factor in the equation is -21

<h3>What is a distributive factor?</h3>

The Distributive Property introduces the multiplication operator an existing mathematical statement that involves the addition operator.

From the complete question, the equation is given as:

$6 \times x= (3 \times 7) + (x \times 7)$