Tristan has $18 in his wallet. He plans to spend $3 per day on lunch. The equation y=−3x+18 represents the total amount of money he has after x days. Graph the equation.

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.

Find an equation of variation where y varies directly as x and y 75 when x5, findy when x is 1