Which polynomial represents the sum below? 3x? +7x+3
5x2 + 12x
+
O A. 15x2 + 19x+ 3
B. 8x2 + 19x+ 3
C. 8x2 + 84x + 3
O D. 15x2 + 84x + 3

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

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet