Brandon bought 14 2/5 pounds of clay to build a volcano for his science project. He used 10 1/2 pounds of clay on his project. How many pounds of clay does he have left? A. 3 1/10
B. 3 2/5
C. 3 9/10
D. 3 1/3

i dont know sorry

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