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mash [69]
3 years ago
7

If Angle 8 is congruent to angle 10 and Angle 1 is congruent to angle 7, which describes all the lines that must be parallel? Li

nes r and s are crossed by lines t and u to form 16 angles. Clockwise from top left, at the intersection of r and t, the angles are 1, 2, 3, 4; at the intersection of s and t, 5, 6, 7, 8; at the intersection of u and s, 9, 10, 11, 12; at the intersection of u and r, 13, 14, 15, 16.
A. Only lines r and s must be parallel.


B. Only lines t and u must be parallel.


C. Lines r and s and lines t and u must be parallel.


D. Neither lines r and s nor lines t and u must be parallel.
Mathematics
2 answers:
NISA [10]3 years ago
4 0

Answer:

C

Step-by-step explanation:

Since they are crossing with each other they're not necessarily parallel with everything but instead themselves.

Mars2501 [29]3 years ago
4 0

Answer:

C

Step-by-step explanation:

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sub for y in other equation
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use quadratic formula
if you have
ax^2+bx+c=0
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b=12
c=16

x=\frac{-12+/- \sqrt{12^{2}-4(1)(16) }}{2(1)}
x=\frac{-12+/- \sqrt{144-64 }}{2}
x=\frac{-12+/- \sqrt{80}}{2}
x=\frac{-12+/- 4\sqrt{5}}{2}
x=\frac{-6+/- 2\sqrt{5}
x=\frac{-6+ 2\sqrt{5} or \frac{-6- 2\sqrt{5}

aprox
x=-1.52786 or -10.4721

those are the numbers

the numbes are -1.52786 or -10.4721

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