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dolphi86 [110]
3 years ago
14

What is the first step to solve the following system of equations using substitution?

Mathematics
1 answer:
Akimi4 [234]3 years ago
3 0

Answer:

Step 1: Solve one of the equations for one of the variables. Let's solve the first equation for x

Thus, option A) is true.

The solution to the system of equations be:

x = 4, y = 5

Step-by-step explanation:

It is important to remember that when we solve the system of equations, the first step we need to do is to solve one of the equations for one of the variables.

Given the system of equations

x - y = -1

2x - y = 3

Step 1: Solve one of the equations for one of the variables. Let's solve the first equation for x

x-y=-1

Add y to both sides

x-y+y=-1+y

x=-1+y

Thus, option A) is true.

<u>NOW LET US SOLVE THE REMAINING PORTION</u>

\mathrm{Subsititute\:}x=-1+y to solve for y

\begin{bmatrix}2\left(-1+y\right)-y=3\end{bmatrix}

-2+y=3

y=5

For x = -1 + y

substitute y = 5

x=-1+5

x=4

Thus, the solution to the system of equations be:

x = 4, y = 5

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Using the binomial distribution, it is found that there is a 0.0108 = 1.08% probability of the coin landing tails up at least nine times.

<h3>What is the binomial distribution formula?</h3>

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In this problem:

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The probability that is lands tails up at least nine times is given by:

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In which:

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P(X = 9) = C_{10,9}.(0.5)^{9}.(0.5)^{1} = 0.0098

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More can be learned about the binomial distribution at brainly.com/question/24863377

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In ΔBCD, \overline{BD}
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Answer:

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Step-by-step explanation:

Given

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Since the sum of the interior angles is equal to the exterior, hence;

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