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yuradex [85]
3 years ago
8

How can I solve systems of equations by substitution method

Mathematics
1 answer:
almond37 [142]3 years ago
5 0
This kind of hard to explain without an example, so I'll do my best...
All you have to do is isolate a variable on one side of the equals sign without a coefficient.  Ex:  x=2y+3  The x is all alone and ready to go into the second equation. 
Substitute into the second equation. Ex: 2x+5=3  Substitute: 2(2y+3)+5=3
I hope this helps! 

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Help me answer this plz I really need help
expeople1 [14]

Answer:

Answer E. is correct

Step-by-step explanation:

b = 3 * c --> c = 1/3 * b

c + 3 = 1/3 * b + 3 --> E.

4 0
3 years ago
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You are building a ramp that must cover a horizontal distance of exactly 17 feet. The angle of the ramp from the ground is 24°.
tiny-mole [99]

Answer:

Length of the ramp = 18.6 feet (Approx.)

Step-by-step explanation:

Given:

Horizontal distance (base distance) = 17 feet

Angle of elevation = 24°

Find:

Length of the ramp

Computation:

Cosθ = Length of base / Length of hypotenuse

Cos 24 = Horizontal distance (base distance) / Length of the ramp

Cos 24 = 17 / Length of the ramp

0.9135 = 17 / Length of the ramp

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6 0
3 years ago
Show 0.00015 in scientific notation
Misha Larkins [42]
I think that the answer is 15*10^5
3 0
3 years ago
Points A, B, and C are collinear. Point B is between A and C. Find the length indicated. AB= 5x-15, BC=3x-5, and AC=28. Find AB
katrin2010 [14]

Answer: AB is 15

Step-by-step explanation: First, you need to draw a picture and label the parts of the line: AB=5x-15; BC= 3x-5; AC =28. Because of the segment addition postulate, you set the equation to be 5x-15+3x-5=28. Then you solve:

5x-15+3x-5=28

Add like terms:

8x-20=28

Add 20 to both sides

8x=48

Divide by 8

x=6

Now, you need to find the measure of AB, so you plug the 6 into the x variable for 5x-15

5(6)-15

30-15

AB=15

4 0
3 years ago
Which one is greater -3 5/8 or -3 2/3
Anvisha [2.4K]

Answer:

-3 2/3

Step-by-step explanation:

Find LCM of fractions by first converting them from mixed fraction to improper fraction

6 0
3 years ago
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