Answer:
It's actually D (2x - 1)(x+1)
Step-by-step explanation:
(3 , -1)
Step by step explanation:
On the x-axis, the dot is below the number 3 and on the y-axis, the dot is on the right side of -1
we know that in direct variation as x increase y also increases.
in indirect variation x decreases y increase and vice versa.
in part a we have x at top (numerator ) and y at denominator it mean indirect variation (as x increases y decreases).
to find k we know that for indirect variation xy=k
if we rewrite the equation x=9/y we get xy=9
which mean k=9 .
in part b we have 4xy=20 if we simplify this equation we get

so here if we rewrite in terms of x.
we get x=5/y which represents indirect variation.
and we know xy=k
we have xy=5 .so k=5
Tom arranged 3 groups of 4