Question

Solve by substitution: 3x+3y=10
-9x - -9y= -30
please help me.

Answer 1

the two equations are identical. Hence, there are infinite number of solutions.

Answer 2

I am guessing that the second equation is \[-9x\color{red}{-}9y=-30\]

Answer 3

Yes sir,

Answer 4

then I rest my case.

Answer 5

So is there even one solution to find x, and y?

Answer 6

nope. there are infinite solutions.
the two lines overlap eachother. hence, any point that lies on one line will also lie on the other line.

Answer 7

Ohh awesome, so in other words this was like a trick question?

Answer 8

yes this was a trick question

Answer 9

no, i've seen this type of question a lot