No equation is true when the value of x is 8
Step-by-step explanation:
The equation is true if the left hand side is equal to the right
hand side, to prove that
- Write the left hand side
- Substitute the value of x
- Find the value of the left hand side (L.H.S)
- If the answer equal the value in the right hand side (R.H.S then the equation is true at this value of x
A.
∵ 6x - 20 = 32
∴ L.H.S = 6x - 20
∵ x = 8
∴ L.H.S = 6(8) - 20 = 48 - 20 = 28
∵ R.H.S = 32
∴ L.H.S ≠ R.H.S
∴ The equation is not true when x = 8
B.
∵ 16 - [tex]\frac{1}{8}[/tex] x = 12
∴ L.H.S = 16 - [tex]\frac{1}{8}[/tex] x
∵ x = 8
∴ L.H.S = 16 - [tex]\frac{1}{8}[/tex] (8) = 16 - 1 = 15
∵ R.H.S = 12
∴ L.H.S ≠ R.H.S
∴ The equation is not true when x = 8
C.
∵ 20 - 0.4x = 13.8
∴ L.H.S = 20 - 0.4x
∵ x = 8
∴ L.H.S = 20 - 0.4(8) = 20 - 3.2 = 16.8
∵ R.H.S = 13.8
∴ L.H.S ≠ R.H.S
∴ The equation is not true when x = 8
D.
∵ [tex]\frac{1}{5}[/tex] x + 12 = 30
∴ L.H.S = [tex]\frac{1}{5}[/tex] x + 12
∵ x = 8
∴ L.H.S = [tex]\frac{1}{5}[/tex] (8) + 12 = [tex]\frac{8}{5}[/tex] + 12 = 13.6
∵ R.H.S = 30
∴ L.H.S ≠ R.H.S
∴ The equation is not true when x = 8
No equation is true when the value of x is 8
Learn more:
You can learn more about the equations in brainly.com/question/2386054
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