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vovangra [49]
3 years ago
10

-2x-2y=-8 -4x-8y=-20

Mathematics
1 answer:
Citrus2011 [14]3 years ago
8 0

Answer:

-2x-2y=-8

-4x-8y=-20

From the 1st eqn

Dividing through by 2

you have

-x-y=-4

Multiply through by -(minus)

x+y=4

x=4-y

Substitute into eqn 2

-4x-8y=-20

-4(4-y)-8y=-20

-16 + 4y - 8y = -20

-4y = -20 +16

-4y = -4

y= 1

Substitute into any of the other eqn's to get x

x= 4-y

x= 4-1

x=3

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Using the problem below, solve and explain how you got the solution to the system of equation.
Paul [167]

Answer:

(5, -3)

y= -3

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Step-by-step explanation:

-x-2y=1

x+y=2

solve the equation

-x-2y=1

x=2-y

substitute the value of x into an equation

-(2-y)-2y=1

remove parenthesis

-2-y-2y=1

subtract y to 2y

-2-y=1

add 2 from both sides

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divide both sides by -y

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substitute the value of y into an equation

x=2-(-3)

remove parenthesis

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7 0
3 years ago
The question is in the picture please explain.
lapo4ka [179]

Answer:

x = 78

Step-by-step explanation:

Look at Triangle DBH. Two of its angles are known. Let y = <DHB

47 + 31 + y  = 180        All triangles have 180 degrees. Combine the left.

78 + y = 180                Subtract 78 from both sides.

78-78+y = 180-78        Combine

y = 102

Notice that y + x = 180   They form a straight line.

102 + x = 180                   Subtract 102 from both sides.

x = 78

You should notice that x is an exterior angle. (I didn't at first).

Exterior angles are the sum of the two remote interior angles which in this case, are 31 + 47 = 78

Much shorter and much easier.

3 0
3 years ago
How do you get the top one to the bottom one
Bas_tet [7]
-3-3 = -6 and 4x-x = 3x
4 0
3 years ago
Find sin 0. Please and thank you
fenix001 [56]

Answer:

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8 0
2 years ago
Angles A and B are complementary. What is mB if mA = 5°?<br> 175<br> 90<br> 85<br> 45
Anuta_ua [19.1K]

Answer:

85

Step-by-step explanation:

complementary angles = 90* so  85+5=90

7 0
3 years ago
Read 2 more answers
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