Need Help. find the area thats all

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?