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

Answer 1

if we're doing substitution, i'd put that first one into the second equation.... what choice would that be...?

Answer 2

replace the x in the second equation with 2y+3...

Answer 3

so it would be B?

Answer 4

yep...:)

Answer 5

thanks (:

Answer 6

yw...:)