Question

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?

5x + 10y - 6 = 18
5y - 6 + 10y = 18
5y - 30 + 10y = 18

Answer 1

5y - 30 + 10y = 18 <== ur answer

Answer 2

5x + 10y = 18

x = y -6, we substitute this into first equation.

5x + 10y = 18

5*(y - 6) + 10y = 18

5y - 30 + 10y = 18

So it the last option from the top.