Question

When solving the system x+2y=9 and x-y=6 which expression could be substituted for the x in the second equation?

I think the answer is 9-x? is that correct?

Answer 1

x = 9 -2y

sub that in for x in the second eqn:

(9-2y) -y =6

-3y = -3
y=1

Plug y=1 in to the first equation to get your x-value.

Answer 2

x +2(1) =9

x = 7

Answer 3

Does the method make sense to you?

Answer 4

yes

Answer 5

thank you