5x + 10y = 18

x = y - 6

Which of the following equations is the result of substituting y - 6 in for x in the first equation?

a) 5x + 10y - 6 = 18

b) 5y - 6 + 10y = 18

c) 5y - 30 + 10y = 18

I believe the correct answer from the choices listed above is option C. The result of substituting y - 6 in for x in the first equation would be 5y - 30 + 10y = 18. This is done as follows:

5x + 10y = 18

5 (y - 6) + 10y = 18

5y - 30 + 10y = 18

Hope this answers the question. Have a nice day.