What is the graph plot for 3/4x+1/4y=13/2

Carl wants to buy a television that cost $500 including taxes. to pay for television he will use a payment plan that requires him to make a down payment of $125 and then pay $70.50 each month for six months what is the percent increase from the original cast of the television to the cost of the television using a payment plan.

Can someone me i’m confused. will give brainliest and a whole bunch of points

What is the t intercept of the line given by the equation below y= -10x + 14