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4 years ago

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Mathematics

2 answers:

slega [8]4 years ago

8 0

Answer:

n=4

Step-by-step explanation:

(7+1)+n=(4+7)+1

7+1+n=4+7+1 (subtract 7 from both sides)

1+n=4+1

1+n=5

n=5-1 (Subtract 1 from both sides)

n=4

olga nikolaevna [1]4 years ago

6 0

Answer:

n = 4

Step-by-step explanation:

Actually, in this problem, you can compare the numbers on the right to the numbers on the left and see that n must be 4 to make the lists match. (It's a problem in pattern matching.)

If you need to, you can rearrange the numbers:

(7 + 1) + n = (7 + 1) + 4

If that doesn't work for you, you can add up the numbers on each side and form the equation ...

8 + n = 12

In second-grade terms, this is ...

8 + ___ = 12

Hopefully, you are sufficiently familiar with your math facts to know that 4 will complete this math fact.

If that doesn't work for you, then invoke the addition property of equality and add -8 to both sides of the equation.

8 -8 +n = 12 -8

n = 4

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Which shows the correct substitution of the values a, b, and c from the equation 0 = – 3x2 – 2x + 6 into the quadratic formula?

ZanzabumX [31]

Answer:

shows correct substitution of the values a, b, and c from the given quadratic equation into quadratic formula.

Step-by-step explanation:

Given: The quadratic equation

We have to show the correct substitution of the values a, b, and c from the given quadratic equation into quadratic formula.

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3 years ago

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4 years ago

The x coordinate of the solution to the system of equations y=x+4 and 3y=-2x+2

Vera_Pavlovna [14]

<h2>Hello!</h2>

The answer is:

The x-coordinate of the solution to the system of equations is:

$x=-2$

We can solve the problem writing both equations as a system of equations.

So, we are given the equations:

$\left \{ {{y=x+4} \atop {3y=-2x+2}} \right.$

Then, solving by reduction we have:

Multiplying the first equation by 2 in order to reduce the variable "x", we have:

$\left \{ {{2y=2x+2*4} \atop {3y=-2x+2}} \right.$

$5y=2x-2x+8+2\\\\5y=8+2\\\\y=\frac{10}{5}=2$

Now, substituting "y" into the first equation, to isolate "x" we have:

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

Hence we have that the x-coordinate of the solution to the system of equations is

$x=-2$

Have a nice day!

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3 years ago

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azamat

Answer:

8/9

Step-by-step explanation:

Multiply the given equation by 2/(9a).

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8/9 = 2b/a

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3 years ago

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yKpoI14uk [10]

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