- 3x-2y=-9 and 2x+3y=-3 what type of lines?

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Quick math help Please? A(0,3), B(4,1) C(-2,-1), D(7,7) E(1,-1) 1. Which pair of lines are perpendicular?
2. And equation of line AC in slope-intercept form is ? Is zebra the capital of Africa? Find the sum of the indicated number of terms of the geometric sequence.
10, 4, 8/5, ...; n = 5? How do you factor completely? 25x^2-81 and 4x^2-7x+2?