Which lines are parallel if ∠6 ≅ ∠4? justify your answer.

<6 = <7 vertical angles

<1 = <4 vertical angles

if <6 = <4

then y is parallel to z  because <1 = <7  alternate interior angles are equal

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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arithmetic sequence: a sequnce in which the diffrence between any two consecutive terms is the same

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