Ajazz concert brought in $124,000 on the sale of 7,800 tickets. if the tickets sold for $1o and 20$ each, how many of each type of ticket were sold?

I think 7,800 it says so in the text sorry if this is wrong.

d. vertex

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18