solve using substitution method:
-x-3y=-20,
5x+3y=40

Question

solve using substitution method:
-x-3y=-20,
5x+3y=40

lgbasallote · Answer

go guyss! :DD

anonymous · Answer

$$5 (20-3 y)+3 y=40 $$$$y=5 $$

anonymous · Answer

-x-3y=-20
-x=-20+3y
x=20-3y

5(20-3y)+3y=40
100-15y+3y=40
100-12y=40
-12y=-60
y=5

anonymous · Answer

Then plug the y value back into the one of the equations at the top, and you should get the answer for x

anonymous · Answer

From first equation x=20-3y.
Now substitute this in second one for x.
5(20-3y)+3y=40
Gives 100-12y=40
Implies 12 y=60 which means y=5
Now we have x=20-3y=20-3(5)=5
So answer is x=5 and y=5

anonymous · Answer

Thank you so much. I have watched so many videos trying to understand this and seeing both of you explaining it makes so much sense now. :)