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Ne4ueva [31]
3 years ago
12

What is the measure of DEF?

Mathematics
1 answer:
Tems11 [23]3 years ago
5 0

The measures of triangle def is ,

78+x+x=180

78+2x=180

2x=180-78

2x=102

x=102÷2

x=51

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7x - y = - 1 + -7x + 3y = - 25
Fittoniya [83]
Hope this helps you out :D

It’s 2 equations so in order to solve the previous system, you can use different methods, as for example substitution or addition of equations. In this case, you use the second one, due to the fact you have 7x in one equation and -7x in the other equation. In this way you can easily eliminate variable x and then solve for y. With the value of y you can replace in any of the two equations and solve for x.

7x-y=-1
-7x+3y=-25

Summarizing, you proceed as follow:
- add up the given equations

7x - y = -1

-7x+3y=-25
——————
0 +2y=-26

- solve for y in the previous equation

2y=-26
y=-26/2
y=-13


- replace the obtained value of y in one of the given equations, and solve for x

7x-(-13)=-1

7x+13=-1

7x=-1-13

7x=-14

x=-14

x=-14/7

x=-2


Hence, the solution of the given systems of equation is:

X=-2

Y=-13

4 0
3 years ago
Carly wants to buy 10 litres of
yuradex [85]

Answer:

The correct answer is:

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4 0
3 years ago
What is the value of 0.1322 rounded to the nearest hundredth place?
kifflom [539]

Answer:

Step-by-step explanation:

0.1322 ≅ 0.13

3 0
3 years ago
Read 2 more answers
Which of these are proportional?!?!
sergiy2304 [10]
The first is proportional the second is proportional and the third is not proportional
3 0
3 years ago
Equations of Lines help!
Vedmedyk [2.9K]
The answer is D. Note that the y-intercept is -3, not 3. So, when x is at 0, y should be -3. Choice D is the only graph with a y-intercept of -3.
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