8x-2=-9+7x and also what is a/3+4=6

P= $1400,300 r = 7 1/2% t = 4 what is i ? $4.29 $429.00 $4290.00

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?