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Yakvenalex [24]
4 years ago
9

Mm

Mathematics
1 answer:
Novay_Z [31]4 years ago
8 0

Answer:

x + 2(2x-4) = 10

Step-by-step explanation:

Here in this question, we want to select which is the correct answer if we substitute for the value of y in the second equation, using the first.

In the first, we have;

y = 2x -4

Now, let’s input this value of y into the second equation.

By direct substitution, what we have is the following;

x + 2y = 10

—-> x + 2(2x -4) = 10

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8 0
3 years ago
What are the determinants for solving this linear system?<br> 5x + 3y = 17<br> −8x − 3y = 9
Ksivusya [100]
For this case we have the following system of equations:
 5x + 3y = 17
 -8x - 3y = 9
 We can rewrite the system like:
 Ax = b
 Where,
 A = [5   3; -8   -3]
 b = [17; 9]
 x = [x; y]
 The determinant of matrix A is given by:
 lAl = ((5) * (- 3)) - ((3) * (- 8))
 lAl = (-15) - (-24)
 lAl = -15 + 24
 lAl = 9
 Answer:
 
The determinant for solving this linear system is:
 
lAl = 9
3 0
3 years ago
Read 2 more answers
After 2 1/2 days the johnsons had used 2 2/3 tanks of gas how many tanks of gas were they using per day
Ahat [919]

Answer:

See explanation

Step-by-step explanation:

According to the question, Johnson used 2 2/3 tanks of gas in 2 1/2 days Thus;

If 8/3 tanks of gas were used in 5/2 days,

Then in 1 day , 5/2 × 3/8 = 15/16 or 0.9 tanks were used per day

5 0
3 years ago
2. A train travels at 100 miles per hour. Write an equation that compares the time (t) with the distance (d).
aev [14]

Answer:

c) d= 100t because d=speed×time

7 0
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