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1 year ago

Substitution method...need help.. started but cant finish

Mathematics

1 answer:

trapecia [35]1 year ago

8 0

Solve either equation for either variable. Since the second one has y on its own, the easiest choice is to solve that for y.

-5x + y = 13 ⇒ y = 5x + 13

Now substitute this into the other equation to eliminate y and rewrite it entirely in terms of x :

-3x + 3y = 3 ⇒ -3x + 3 (5x + 13) = 3

Simplify and solve for x :

-3x + 15x + 39 = 3

12x = -36

x = -3

Substitute this into either original equation to solve for y. Plugging x = -3 into the first equation would give

-3 (-3) + 3y = 3

9 + 3y = 3

3y = -6

y = -2

So the solution to the system of equations is (x, y) = (-3, -2).

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Delicious77 [7]

Answer:

320 yards

Step-by-step explanation:

Alright, there was a lot of addition, and you're just gonna have to trust me, the answer is 320 yards

6 0

2 years ago

Whats the answer to #9 i need help fast!!

vekshin1

I got 784 inches cubed, I cut the figure into two, the first one was 8×4×14=448, the second was 8×3×14=336,
therefore 448+336=784

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2 years ago

Fosmine lounches a model rocket from a elift. The rocket goes up 16.8 feet above the cliff,

7nadin3 [17]

Answer: The final answer I got is -44.9

Step-by-step explanation: At the first chose I put Positive, then at the second choise I put negative, at the third choose I put 16.8-(-28.1), and at the last choice I put -44.9.

3 0

3 years ago

Question 3 options:

melomori [17]

The height of an object can be represented as a function of time.

It takes the rocket 25 seconds to hit the ground

The height function is given as:

$\mathbf{h(t) = 400t - 16t^2}$

When the rocket hits the ground, we have:

h(t) = 0

So, the height function becomes

$\mathbf{ 400t - 16t^2 = 0}$

Rewrite as:

$\mathbf{ 16t^2 = 400t}$

Divide both sides by 16t

$\mathbf{ t = 25}$

Hence, it takes the rocket 25 seconds to hit the ground

Read more about height functions at:

brainly.com/question/22573423

5 0

2 years ago

Area of Composed Figures - Quiz-Level G

4vir4ik [10]

The number of square feet of the carpet is the area of the carpet

The number of square feet of outdoor carpet is 32 feet

<h3>How to determine the number of square feet</h3>

To do this, we simply divide the carpet to regular shapes.

The outdoor carpet can be divided to the following shapes from top to bottom

Rectangle of 4 ft by 2 ft
Rectangle of 6 ft by 2 ft
Rectangle of 6 ft by 2 ft

So, the area of the outdoor carpet is:

Area = 4 * 2 + 6 * 2 + 6 * 2

This gives

Area = 32

Hence, the number of square feet of outdoor carpet is 32 feet