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Scorpion4ik [409]
3 years ago
14

How to solve a system of equations using elimination

Mathematics
2 answers:
mestny [16]3 years ago
3 0
In order to use the elimination<span> method, you have to create variables that have the same coefficient—then you can eliminate them. Multiply the top </span>equation<span> by 5. Next add the</span>equations<span>, and </span>solve<span> for y. Substitute y = 10 into one of the original </span>equations<span> to find x</span>
dimulka [17.4K]3 years ago
3 0

To solve a system of equations by addition, also called elimination, the goal is to cancel out one of the variables by adding the equations together. However, in some cases, you will need to multiply one or both of the equations by a number in order to create a scenario where one of the variables will cancel out when the equations are added together. As long as you cancel a variable out, you will be able to add the equations together and solve for the variable. If you find one variable, you can find the other one easily.

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Please show working out thanks
IgorLugansk [536]

Answer:

10m x 15m

Step-by-step explanation:

You are given some information.

1. The area of the garden: A₁ = 150m²

2. The area of the path: A₂ = 186m²

3. The width of the path: 3m

If the garden has width w and length l, the area of the garden is:

(1) A₁ = l * w

The area of the path is given by:

(2) A₂ = 3l + 3l + 3w + 3w + 4*3*3 = 6l + 6w + 36

Multiplying (2) with l gives:

(3) A₂l = 6l² + 6lw + 36l

Replacing l*w in (3) with A₁ from (1):

(4) A₂l = 6l² + 6A₁ + 36l

Combining:

(5) 6l² + (36 - A₂)l +6A₁ = 0

Simplifying:

(6) l² - 25l + 150 = 0

This equation can be factored:

(7) (l - 10)*(l - 15) = 0

Solving for l we get 2 solutions:

l₁ = 10, l₂ = 15

Using (1) to find w:

w₁ = 15, w₂ = 10

The two solutions are equivalent. The garden has dimensions 10m and 15m.

3 0
3 years ago
Can anyone help me with 2 and 3 (different one)
Aloiza [94]
Fraction would be 30/100 and decinal would be .30 and ratio would be 30/100
5 0
2 years ago
Read 2 more answers
Simplify your answer
DerKrebs [107]

Answer:

F(x) =-4(x+3)+5= - 4x-12+5= - 4x-7

Step-by-step explanation:

Please Brainlist me

4 0
2 years ago
Factor 48m - 80n.<br> 16mn(3m - 5n)<br> 16(5n - 3m)<br> 16(3m - 5n)
aliya0001 [1]
The correct answer for this would be the last option. The factors of 48m - 80n are 16(3m - 5n). If you try to solve this, the result would be 48m - 80n. 16 x 3m would be 48m and 16 times 5n would be 80n. Hope this is the answer that you are looking for. 
4 0
3 years ago
Factor the following polynomial completely. 5x4+20x3-105x2
worty [1.4K]

Answer:

5x^{2}(x+7)(x-3)

Step-by-step explanation:

5x4+20x3-105x2

5x2( x^2 +4x -21)

5x^{2}(x+7)(x-3)

4 0
2 years ago
Read 2 more answers
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