Which pair of equations when graphed has lines that are perpendicular?

a. y= 2x- 7
x+ 3y= 3
b. 2y= -3x+ 5
2x- 3y= 4
c. 5x- 8y= 9
12x- 5y= 7
d. 3x+ 6y= 8
y= 3x- 8

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.