The price of a necklace was increased by 10% to £154. what was the price before the increase?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

What is the difference between the equations of a vertical and a horizontal line?