Trapezoid abcd has parallel sides ab and cd, of lengths a and b respectively. diagonals ac and bd intersect at e. draw the line through e that is parallel to ab and cd, and let p and q be its intersections with ad and bc respectively. (a) prove that e is the midpoint of p q. (b) show that p q = 1 1 2 1 a + 1 b . p q is known as the harmonic mean of a and b

i dont know

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

they can both be solutions depends on the equation

step-by-step explanation:

what is the equation? ?

more detail

step-by-step explanation: