Sandy drew 2 cards from a deck of regular playing cards. the first cards value was 3 times the value of the second card. the second cards value was 6 less than the first card. what 2 cards did she draw

Can someone explain the elimination method to me for this problem?

Stefano accidentally dropped his sunglasses off the edge of a canyon as he was looking down. the height, h(t), in meters (as it relates to sea level), of the sunglasses after t seconds, is shown in the table. during its descent, the pair of sunglasses passed by a climber in the canyon 6 seconds after stefano dropped them. to the nearest meter, what is difference in elevation between stefano and the climber? 166 meters 176 meters 230 meters 240 meters its b.176 i took the test 166 is wrong and 176 is correct

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities