If 8=10 and 1=7, which describes all the lines that must be parallel?

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

Step-by-step explanation:

If which are alternate interior angle corresponding to line t and u.

then by Alternate interior angle property :

Lines t and u must be parallel.

If which are alternate exterior angle corresponding to line r and us.

then by Alternate exterior angle property :

Lines r and s must be parallel.

Hence, Lines r and s and lines t and u must be parallel.

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.

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step-by-step explanation: easy math