Using substitution to solve the system x = 2y + 3 and 4x - 5y = 9, which of the following could be the first step?
A. x - 2y = 3
4x - 5y = 9
B. 4(2y + 3) - 5y = 9
C. x + 2y = 4x - 5y
D. 5x - 3y = 12
E. - 3x + 7y = -6

Question

Using substitution to solve the system x = 2y + 3 and 4x - 5y = 9, which of the following could be the first step?
	A.	x - 2y = 3
4x - 5y = 9
	B.	4(2y + 3) - 5y = 9
	C.	x + 2y = 4x - 5y
	D.	5x - 3y = 12
	E.	- 3x + 7y = -6

callisto · Answer

put x=2y+3 into 4x - 5y = 9
4(2y+3) - 5y = 9

callisto · Answer

i hope you understand what the meaning of substitution is..

anonymous · Answer

substitution is when u place the value of something into an equation. 
In this case you have x equals 2y + 3 so u can put that into the equation 4x - 5y = 9 to get 4(2y+3) - 5y = 9