Pls helpp

Find the following products. Show and justify each step.
a. (−3x)(−2xy) b. 3x2(xy3)
c. (2a2)(−3ab3) d. (−4x)(−5x2y)

A) (-3x) (-2xy)

Multiply the numbers and get 6xxy (6x^2y)

B) 3x^2(xy^3)

add up exponents in both... so 3 x^ (2+1) y^(3)

making it 3x^3y^3 (3x cubed y cubed)

C) 2a^2 (-3ab^3)

Do the same as above, but multiply the coefficients as well.

2*-3 = -6, a^(2+1), and b ^3

-6a^3b^3 (negative six a cubed b cubed)

D) -4x (-5x^2 y)

Follow same steps as C

-4 * -5 = 20, x^(1+2 ) = x^3, y

20x^3y (twenty x cubed y)

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