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3 years ago

Find the value of x. Round to the nearest tenth.

Mathematics

1 answer:

serg [7]3 years ago

8 0

Answer:

Where is the equation?

Step-by-step explanation:

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Solve the system of linear equations using the elimination method x=3y;3x-2y=14

vladimir1956 [14]

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}x=3y&\text{subtract}\ 3y\ \text{from both sides}\\3x-2y=14\end{array}\right\\\\\left\{\begin{array}{ccc}x-3y=0&\text{multiply both sides by (-3)}\\3x-2y=14\end{array}\right\\\underline{+\left\{\begin{array}{ccc}-3x+9y=0\\3x-2y=14\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad7y=14\qquad\text{divide both sides by 7}\\.\qquad\qquad y=2\\\\\text{put the value of y to the first equation:}\\x=3(2)=6$

7 0

3 years ago

Can seven go into three

Thepotemich [5.8K]

Not exactly as the answer is 0.428571428571428571 and continues infinitely repeating the 6 digits "428571" in sequence

4 0

3 years ago

A $40 shirt now selling for $28 is discounted by what percent?

motikmotik

Answer:

30%

Step-by-step explanation:

Think of this as converting a fraction. 28/40 to x/100. You do this because in the situation, 40 is 100 percent of the price. So 28 is <em>x</em> percent of 100.

You multiply 40 by 2.5 to get to 100, so multiply 28 by the same number to get x. 28 * 2.5 = 70.

So 28 is 70 percent of 40. But the question is asking by what percentage it is <em>discounted. </em>If it's now selling for 70%, it has been discounted 30%. So the answer is 30%

3 0

3 years ago

Is 6 a solution to the equation x^2 - 4 = 5x? Please tell me why or why not

TEA [102]

Answer:

6 is not a solution to the given equation.

Step-by-step explanation:

We are given the equation $x^2-4=5x$

We need to know whether or not x=6 is a solution. This means that we should substitute in 6 for each instance of x. Then, if both sides of the equation are equal, then 6 is a solution to the equation.

$x^2-4=5x\\\\(6)^2-4=5(6)\\\\36-4=30\\\\32=30$

As 32 ≠ 30, 6 is not a solution to the given equation.

3 0

3 years ago

Solve −3.5 =

Ugo [173]

X = -14
This is the answer

6 0

3 years ago