the holiday party will cost $800 if 40 people attend.
first we need to find how much it costs per person.
we know it costs $20 per person so we can calculate how much it costs for 40 people.
i believe michael would be 36. hope this
x = michael age
y = brandon age
x = 4y
x = y + 27
put the system of linear equations into standard form
x - 4y = 0
x - y = 27
x = michael age = 36
y = brandon age = 9