Multiplying complex numbers (6-5i)(3-10i)

-32 - 75i

Step-by-step explanation:

(6-5i) × (3-10i)

6 × (3 - 10i) +(-5i × (3 - 10i))

18 - 60i + (-15i + 50i ^ 2)

18 - 60i - 15i + 50i ^ 2

18 - 75i + 50i ^ 2

18 - 75i + 50(-1) (Note: i ^ 2 is equal to -1 )

18 - 75i - 50

-32 - 75i

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

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step-by-step explanation: