how can you tell is an equation is linear? is y=3x linear?
A linear equation can be written in the form y=mx+b or Ax+By=C.
Where, m,b,A,B,C are constants.
Linear equation only contain x and y. It does not have higher powers of x and y like x^2,y^2,x^3,y^3 etc. It may contain only x or y also.
Linear equation is called linear because its graph would be a straight line.
Examples of linear equation: y=5x+6 , y=9x , y= -4x+3 , y=-6x-1 , y=6 ...
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