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3 years ago

Idk how to do this and I need it in an hour

Mathematics

1 answer:

olchik [2.2K]3 years ago

4 0

Answer:

a) $2x^2+8-5x+-3x^2-4+7x\\\\= -1x^2+2x+4$

b) $2x^2+8-5x--3x^2-4+7x\\\\= 5x^2+2x+4$

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Given the system of linear equations.

Degger [83]

Part(A):

To solve the system of Linear equations using Substitution:

$x+y=7 \\ 2x+y=5$

Consider the first equation, x+y=7 implies x=7-y

$\mathrm{Subsititute\:}x=7-y$

$2\left(7-y\right)+y=5$

$14-2y+y=5$

$14-y=5$

$\mathrm{Subtract\:}14\mathrm{\:from\:both\:sides}$

$14-y-14=5-14$

$-y=-9$

$\mathrm{Divide\:both\:sides\:by\:}-1$

$y=9$

$\mathrm{For\:}x=7-y$

$\mathrm{Subsititute\:}y=9$

$x=7-9=-2.$ $\mathrm{The\:solutions\:to\:the\:system\:of\:equationts\:are:}$

$y=9,\:x=-2$

PArt(B): Use a graph to verify your answer to the system:

Using Desmos graphing calculator, graph the two equations.

8 0

3 years ago

Read 2 more answers

A 10-ounce box of cereal sells for $3.30. A larger box advertises, "10% more-free!" and sells for the same price. What is the co

sergij07 [2.7K]

Answer:

30 cents

Step-by-step explanation:

The box would have 11 oz. (10x1.1)

$3.30/11=30cents

7 0

3 years ago

Use a common denominator to write an equivalent fraction for each fraction. 5/12, 2/9

lapo4ka [179]

Answer: common denominator 108

Step-by-step explanation:

Gcf= 108

9 * 12

45/108 and 24/108

6 0

3 years ago

Anyone know this??????

Ksju [112]

Answer:

Verticle or straight line.

Step-by-step explanation:

I learned that in elementary.

4 0

3 years ago

When 3(2x + 5) is added to 2(2x − 4) the resulting expression is?

velikii [3]

Answer:

10x + 7

Step-by-step explanation:

3(2x + 5) added to 2(2x - 4) is the same as 3(2x +5) + 2(2x - 4)

Remember PEMDAS

P – Parentheses (distribution)

E – Exponents

M – Multiplication

/D – Division (whichever comes first from left to right)

A – Addition

/S – Subtraction (whichever comes first from left to right)

First, we will distribute the left side.

3(2x + 5)

3 * 2x = 6x

3 * 5 = 15

Add them together to get:

6x + 15

6x + 15 + 2(2x - 4)

We must now distribute the right side.

2 * 2x = 4x

2 * -4 = -8

Add them together to get:

4x -8

We now have:

6x + 15 + 4x - 8

<u>Let's combine like terms.</u>

6x and 4x are like terms.

Combine: 6x + 4x = 10x

15 and -8 are like terms.

15 - 8 = 7

Now we have 10x + 7

Since 10 and 7 don't have any GCF, we have our answer.

10x + 7

~ $InLoveWithPugs$

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8 0

3 years ago