Find the total surface area of the pyramid (will give brainliest!!!)

the answer is d

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

answer for #1 is c

answer for #2 is d

can i get brainliest

d 600 because 15*10*2=300

300+300=600

step-by-step explanation: