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3 years ago

Which equation has the solution x=4: 4x=20 x/2=8 x+8=3x x =x+5/2

Mathematics

2 answers:

borishaifa [10]3 years ago

8 0

Step-by-step explanation:

4x = 20

x = 20/4 = 5

x/2 = 8

x = 8 x 2 = 16

x + 8 = 3x

8 = 3x - x

8 = 2x

8/2 = x

4 = x

x = x + 5/2

2x = 5/2

x = 5/2 x 2

x = 5

nignag [31]3 years ago

3 0

Answer:

x+8=3x

Step-by-step explanation:

4x=20

4x/4=20/4

x=5

The solution to the first equation is x=5.

x/2=8

2(x/2)=2(8)

x=16

The solution to the second equation is x=16.

x+8=3x

x+8-x=3x-x

8=2x

8/2=2x/2

x=4

The solution to the third equation is x=4.

x=x+5/2

x-x=x+5/2-x

-x=5/2

x=-5/2

The solution to the fourth equation is x=-5/2.

The equation x+8=3x has the solution to x=4.

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Step-by-step explanation:

Let A and B are two angles, in which A is " $\frac{1}{2}$ " complementary angles and B be is another complementary angle.

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Solution:

$\ A = \ 3B - 18 \\\\ \ put \ the \ value \ of \ A \ in \ equation.....(i) \\\\ \ Equation: \\ \\\Rightarrow \ A\ +\ B \ =\ 90 \\\\\Rightarrow \ 3B\ -\ 18 \ + \ B \ = \ 90 \\\\\Rightarrow \ 4B \ = \ 90 +18 \\\\\Rightarrow \ 4B = 108 \\\\ \Rightarrow B = \frac{108}{4} \\\\ \Rightarrow B \ = \ 27\\$

$\ put \ the \ value \ of \ B \ in \ equation (i).\\\\ \ Equation: \\\\\Rightarrow A+B=90\\\\\Rightarrow A+27=90\\\\\Rightarrow A=90-27\\\\\Rightarrow A= 63$