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luda_lava [24]
3 years ago
9

The measure of angle B is 839, and the measure of angle C is 420.

Mathematics
1 answer:
Usimov [2.4K]3 years ago
8 0

Answer: C. 55 degrees

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A system of equations is shown below: x + 3y = 5 (equation 1) 7x − 8y = 6 (equation 2) A student wants to prove that if equation
eduard

First Let we solve the Original system of equations:

equation (1): x+3y=5

equation (2): 7x-8y=6

Multiplying equation (1) by 7, we get

7x+21y=35                          -->(3)

7x-8y=6                           --> (2)

Subtracting,

29y=29 implies y=1

Thenx=5-3(1)=2

Thus the solution of the original equation isx=2, y=1.

Now Let we form the new equation:

Equation 2 is kept unchanged:

Equation (2):7x-8y=6

Equation 1 is replaced with the sum of equation 1 and a multiple of equation 2:

Equation (1): 8x-5y=11

Now solve this two equations: 8x-5y=11, \\                                                    7x-8y=6

Multiply (1) by 7 and (2) by 8,

56x-35y=77

56x-64y=48

Subtracting,29y=29 implies y=1

Then x=2.

so the solution for the new system of equation is x=2, y=1.

This Show that the solution to the system of equations 8x − 5y = 11 and 7x − 8y = 6 is the same as the solution to the given system of equations

4 0
3 years ago
Read 2 more answers
2x - 5 = 23(19) - 56 4x2 + 2(14) = 102/2
ra1l [238]

Answer:

2x-5=23(19)-56\\x=193

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

4x(2)+2(14)=\frac{102}{2}\\x=\frac{23}{8}

Step-by-step explanation:

7 0
2 years ago
-1+|10-8x|=-55...help!!!!
Lunna [17]
Quite simply, this equation has no solution, because an absolute value is never negative (like -55 is negative).  No solution.
5 0
3 years ago
Can you Help me on 23 ?
bixtya [17]

Answer:

<u>x</u><u> </u><u>is</u><u> </u><u>1</u><u>1</u>

Step-by-step explanation:

{ \sf{ \sqrt{x + 5}  - 3 = 1}} \\ { \sf{ \sqrt{x + 5} = 4 }} \\ { \sf{x + 5 = 16}} \\ { \sf{x = 11}}

5 0
3 years ago
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Sloan [31]

Answer:

Yes

Step-by-step explanation:

Both angles can be 90 degrees

4 0
3 years ago
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