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Georgia [21]
2 years ago
9

Solve the linear equation by using substitution X-y=-4 3x-y=-10

Mathematics
1 answer:
svetoff [14.1K]2 years ago
7 0

Answer:

(-3, 1)

Step-by-step explanation:

x-y=-4

3x-y=-10

------------

y=x-(-4)=x+4

3x-(x+4)=-10

3x-x-4=-10

2x-4=-10

2x=-10+4

2x=-6

x=-6/2

x=-3

-3-y=-4

y=-3-(-4)=-3+4=1

x=-3, y=1. (-3, 1).

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Which property of equality should be used with the equation c + 5 = 78 to solve?
rjkz [21]

Answer:

Subtraction property of equality

Step-by-step explanation:

c + 5 = 78

Subtract 5 from each side using the subtraction property of equality

c+5-5 = 78-5

x = 73

5 0
2 years ago
What is the answer for 65=2(d+1)+5d?
vladimir1956 [14]

65 = 2(d + 1) + 5d
65 = 2d + 2 + 5d
65 = 7d + 2
63 = 7d
Finally divide by 7.
d = 63 \div 7 = 9
Hence, the answer is d = 9



5 0
3 years ago
The sail of a boat is in the shape of a right triangle, as shown below:
dolphi86 [110]
Answer: Choice C
7 divided by cosec 50 degrees

=====================================

Explanation:

Abbreviations:
sec = secant
cot = cotangent
cosec = cosecant (csc is also a widely used abbreviation)

-----------------

Let the horizontal leg be x

This leg is opposite the angle 50 degrees. The hypotenuse is 7

Opposite = x
Hypotenuse = 7

We'll either use the sine rule or the cosecant (csc) rule
sine = opposite/hypotenuse
cosecant = hypotenuse/opposite

Since "sine" is nowhere to be found in the answer choices, we'll use the cosecant rule

-----------

cosecant = hypotenuse/opposite
csc(angle) = hypotenuse/opposite
csc(50) = 7/x
x*csc(50) = 7
x = 7/csc(50)

This is why the answer is choice C

6 0
2 years ago
Read 2 more answers
What are different representations of a function?
Soloha48 [4]

Answer:

a function can be represented by a bike

Step-by-step explanation:

a bike has many things that work together to power the bike

the pedals allow the bike to move. the handles allow the bike to move different directions. the wheels allow the bike to move while working withe the pedals and the gears

8 0
2 years ago
Help please asp what does this equal:<br> 1/5.1/5.1/5
motikmotik

Answer:

0.00768935024

((1/5.1)/5.1)/5 = 0

(0.19607843/5.1)/5 = 0

0.03844675/5 = 0

0.00768935 = 0

5 0
2 years ago
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