Answer:
Step-by-step explanation:
2x = 2*x
4y = 2*2*y
Common term = 2
2x + 4y = 2*x + 2*2y
=2*(x + 2y)
there are many types of functions this includes linear function (straight line graph) eg y=3x+2 , quadratic function (u shaped curve) eg y=x², logarithmic function, exponential function and etc
