X+7-6x=19-7x need to find value for x both sides must equal the same

Find the value of x for which the lines are parallel.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Jason went to an arcade to play video games. he paid $2 for every 11 tokens he bought. he spent a total of $16 on tokens. which equation can be used to determine, t, the number lf tokens jason bought