My Linear Expression

STEM

The expression for this graph is ______________. I know this, because y is _____ when x is zero. 

Also, if I plug in (equation) with the number 2, I will get __________. That proves that my equation is _______. I know that this is a linear expression, because __________. 

EXAMPLE

The expression for my graph is y=5x+12. I know this, because y is 12 when x is zero. Also, if I plug in y=5x+12 with the number two, I get 22 (five times two is ten, plus twelve is twenty-two). That proves that my equation is y=5x+12. I now that this is a linear expression, because it is a line.