If a=0, is it still linear? the linear equation is ax+b=c. and if x=0, is it still linear?

Two lines parallel to a third line are parallel to each other. always sometimes or never

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum