How can you determine if the graphs of two lines are parallel or perpendicular without graphing the lines

Dr Adams measures the daily height of a Sunny Yellow sunflower, beginning when the sunfliwer is 60 days old. At 60 days, the height is 205 centimeters. After the first 60 days Dr. Adams finds that the growth rate is 2 centimeters per day.

Two students, Carlos and Sophie, factored the trinomial - 4x2 - 10x + 6. Sophie factored it as - 2 (2x - 1) (x + 3) and Carlos factored it as (x + 3) (-4x + 2).

Kelko, Boris, and Hong have a total of $83 in their wallets. Hong has 2 times what Boris has. Kelko has $7 more than Boris. How much do each have?

two bottles X and Y contain some water. from bottle X we pour into bottle Y twice as much water as bottle Y alredy contains. we then pour from bottle now contain 200 mL. How much water was in each bottle to start with?

6. The measures of the three angles of a triangle are (3x), (x - 15) ° and (2x + 15). What is the measure of the angle with the greatest measure?

Dad mows the lawn. he mows a length of 156 meters in 856 seconds. at what speed was he moving

While the bears were out, Goldilocks ate all but 3/8 of Papa Bear's big green cake off his plate. Then she ate all but 3/8 of the smaller pink cake on Baby Bear's plate.

If there was a circle and i wanted to find out the area. what is the area of a circle with a radius of 5

A patroman gives a driver a speeding ticket if the driver's speed is greater than 15% over the posted speed limits. if the speed limit is 40 miles per hour. what is the highest speed that a driver can go without receiving a ticket?

A bee hummingbird has a mass of 1.8 grams. How many grams are 6 hummingbirds and a 4-gram nest