Question

Use substitution to solve 1-2. 3x – 3y = 9 x= 7 – 3y

Answer 1

Answer:

Solutions are x =4 and y = 1

Step-by-step explanation:

$3x-3y =9$

In this equation substitute $x=7-3y$, we get

$3(7-3y) -3y=9\\21-9y-3y=9\\-12y= 9-21\\-12y= -12\\y=1$

now substitute y =1 in x equation,

$x=7-3(1)\\x=7-3\\x=4$

Solutions are x =4 and y = 1