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ella [17]
3 years ago
14

How can you use substitution to solve a system of linear equations?

Mathematics
1 answer:
makvit [3.9K]3 years ago
6 0
Step 1:
Solve one of the equations for either x = or y = .
Step 2:
Substitute the solution from step 1 into the other equation.
Step 3:
Solve this new equation.
Step 4:
Solve for the second variable.

Example 1: Solve the following system by substitution
Substitution Method Example
Solution:
Step 1: Solve one of the equations for either x = or y = . We will solve second equation for y.
solution step 1
Step 2: Substitute the solution from step 1 into the second equation.
solution step 2
Step 3: Solve this new equation.
solution step 3
Step 4: Solve for the second variable
solution step 4
The solution is: (x, y) = (10, -5)
Hope this helps!
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Triangle abc is equal to triangle pqr, angle p=8x+4, angle a=5x+16 , and angle q=10x+2. find angle r
saul85 [17]

Answer: b.not enough info

Step-by-step explanation:

Corresponding angles of congruent triangles are congruent, so \angle A =\angle P

However, we don't have all 3 interior angles of either triangle, so we cannot conclude anything.

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2 years ago
Carlos has received a 9% salary increase. If he now earns $654 per week, what was his salary before the increase.?
babunello [35]
So let's say he was earring x before his raise. That means that:
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6 0
3 years ago
This is due tonight please help
CaHeK987 [17]

Answer:

81x^4

Step-by-step explanation:

With exponents, whatever is in the parentheses is multiplied by <u>itself</u> however many times the exponent says.

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81x^4

Hope this helps you :)

8 0
2 years ago
Nellie is buying bird seed to put in her bird feeders. she uses about 10 pounds of bird seed each week, but has room to store an
neonofarm [45]
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6 0
3 years ago
Read 2 more answers
Describe how you would use the rules of exponents to simplify (7x?yz) 3. You may indicate an exponent in your answer with ^. For
SVETLANKA909090 [29]

Answer:

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Step-by-step explanation:

One of the rules of exponents demands:

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Furthermore, you use the following rule for exponents of variables that already have an exponent:

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Thus, you can apply this rules in the following way:

(7x^2yz)^3=(7)^3(x^2)^3(y)^3(z)^3=7*7*7x^{2*3}y^3z^3=343x^6y^3z^3

hence, the answer is 343x^6y^3z^3

5 0
3 years ago
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