Question 214876
First, identify the common terms. The terms 6y and -7y are like terms because they have the same variable expression 'y' attached to them. So we can say {{{6y-7y=y(6-7)=y(-1)=-1*y=-y}}} (basically factor out the GCF 'y' and subtract then simplify). In short, {{{6y-7y=-y}}}



In the bigger picture, this means: {{{-3+6y+4x-7y=-3+(6y-7y)+4x=-3-y+4x=4x-y-3}}}



So {{{-3+6y+4x-7y=4x-y-3}}}