Question 169914
To add these expressions, simply combine like terms. Remember, "like" terms are terms that share the same variable AND the same exponent. So in the first example, 3x and x are like terms. Also, 4 and -6 are like terms.



So 3x+x can be written as 3x+1x. Now just add the coefficients 3 and 1 to get 3+1=4. So 3x+x=4x



Do the same with the constants (the terms without variables). So 4+(-6)=4-6=-2


# 1


<pre>

  3x+4
+  x-6
--------
  4x-2


</pre>



So {{{(3x+4)+(x-6)=4x-2}}}



# 2


<pre>

  2x-1
+ -x+1
--------
   x+0


</pre>



So {{{(2x-1)+(-x+1)=x}}}