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Vedmedyk [2.9K]
3 years ago
12

7.

Mathematics
1 answer:
Phoenix [80]3 years ago
3 0

Answer:

hi sister

Step-by-step explanation:

Im also a girl teehee

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How do you know what number to multiply everything by using the elimination method on systems of equations??
Marrrta [24]

Answer:

See below  

Step-by-step explanation:

You multiply the equations by numbers that will give you the least common multiple of the coefficients.

Suppose you have a system of two equations:

\begin{cases}(1)& 2x + y = 40\\(2) & x + 2.5y = 60\end{cases}\\

You can choose to eliminate either x or y.

1. Eliminating x

The coefficients of x are 2 and 1. The least common multiple is 2, so you multiply (1) by 1 and (2) by 2 to get

\begin{array}{lrcll}(3) & 2x + y & = & 40 &\ \\(4) & 2x + 5y & = & 120 & }\\\end{array}

Then you can subtract (3) from (4) and get

4y = 80. Solve for y.

2. Eliminating y

The coefficients of y are 1 and 2.5. The least common multiple is 2.5, so you multiply (1) by 2.5 and (2) by 1 to get

\begin{array}{lrcll}(5) & 5x + 2.5y & = & 100 &\ \\(6) & x + 2.5y & = & 60 & }\\\end{array}

Then you can subtract (6) from (5) and get

4x = 40. Solve for x.

8 0
3 years ago
Please help asap 28 pts
Nat2105 [25]

f(x) = -x+7

f(15) = -15+7

f(15) = -8

7 0
3 years ago
Read 2 more answers
How do you get why by itself in this equation? 4x+5y=5
Alja [10]

Answer:

first we get y on one side by itself.

4x+5y=5

we'll move x to the other side.

4x-4x+5y=5-4x

simplify.

5y=5-4x

now we get rid of the coefficient on y.

5y/5=(5-4x)/5

simplify.

y=5/5-4x/5

y=1- \frac{4}{5}x

The answer is y=1-\frac{4}{5}x

6 0
2 years ago
Please help me out :/
tensa zangetsu [6.8K]
Add up all of your X’s!! then Try and add up all of the degrees I think. Check me if i’m wrong !
7 0
3 years ago
Ali ran 3/10 km before school after school she ran 1/5 km
miss Akunina [59]

Answer:

1/2 km

Step-by-step explanation:

3/10 + 1/5, find common denominators

3/10 + 2/10 = 5/10, simplify

1/2 km

8 0
3 years ago
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