Using the expression 7x=3y if y is 35 what is x

Through: (-3,-3) parallel to y= 7/3x+3

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

Can some one me with these questions