Chin Tam's charge account statement showed a previous balance of $7,112.55, a finance charge of $17.82, new purchases of $86.50 and $111.88, and a payment of $7,080.00.
What is his new balance?

the distance between point a and point b is 6 units

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