Hello! can someone me with a substitution problem? pre-alg level.

3x+9y=42
y=2x

Assemble the proof by dragging tiles to the statements and reasons column

Can anyone me with 32,33,36,37,and 40.

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