Answer:
none of the chartacier
Step-by-step explanation:
Answer:
This system has infinite solutions and it would be much easier to solve it by elimination but substitution it is.
Step-by-step explanation:
-3x+3y=9
-x+y=3
Isolate either x or y in any of the equations. I'll go with the second.
y = 3+x
Now substitute this for y in the first equation.
-3x+3(3+x)=9
Distribute the 3
-3x+9+3x=9
Combine like terms:
9=9
0=0
It's infinite
6 plus 7 is 13, 7 plus 6 is 13, 13 minus 6 is 7, and 13 - 7 is 6.
You can rule out A and C 6/6 makes 1 so that cancels so your answer is D