SOLUTION: My teacher doesn't explain well & I don't understand how to do elimination & substitution problems. ex.-3x-1/2y=10 5x+1/4y=8 How do I figure out this problem? Thank you so

Algebra ->  Functions -> SOLUTION: My teacher doesn't explain well & I don't understand how to do elimination & substitution problems. ex.-3x-1/2y=10 5x+1/4y=8 How do I figure out this problem? Thank you so       Log On


   

Question 82906This question is from textbook Glencoe Algebra 1
: My teacher doesn't explain well & I don't understand how to do elimination & substitution problems.
ex.-3x-1/2y=10
5x+1/4y=8
How do I figure out this problem?
Thank you so much for your help!
Chapter 8.4 Algebra 1 This question is from textbook Glencoe Algebra 1

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
IF YOU MULTIPLY THE FIRST EQUATION BY 1/2 WE GET
-3X/2-1/4Y=10/2 NOW ADD THE SECOND EQUATION THUS:
5X+1/4Y=8
------------------------------------------
-3X/2+5X=10/2+8
-1.5X+5X=5+8
3.5X=13
X=13/3.5 ANSWER.
-3*13/3.5-1/4Y=10
-39/3.5-1/4Y=10
-1/4Y=10+39/3.5
-1/4Y=(35+39)/3.5
-1/4Y=74/3.5
Y=(74/3.5)(-4/1)
Y=-296/3.5 ANSWER.