SOLUTION: 5a-b=12
7a-3b=20
find a and b.
Algebra.Com
Question 699550: 5a-b=12
7a-3b=20
find a and b.
Answer by Stitch(470) (Show Source): You can put this solution on YOUR website!
Given: and
Set both equations equal to zero
Notice that you can make both equations contain -3B if you multiply the first equation by 3.
Simplify
Now both equations have a -3B in them.
Since both equations are equal to zero, you can set them equal to each other.
Add 3B to both sides
Subtract 7A from both sides
Add 36 to both sides
Divide both sides by 8
Now plug 2 into on of the given equations for A. Then solve for B
Subtract 10 from btoh sides
Divide both sides by -1
RELATED QUESTIONS
5a-b=12
7a-3b=20
find a and b.
(answered by Simnepi)
Is this how to reduce this expression?
5a-{-[(-3a+2b)-4b]+[-7a-(a-b)]-3b}... (answered by KMST)
a-b-3b+5a (answered by ikleyn)
7a-4b-[5a-3{b-2(a-b)}] (answered by ladyluck4772)
Find the value of y in the formula y=5a-3b+c, if a=12, b=4, and c=8? (answered by PRMath)
Find the value of y in the formula y=5a-3b+c, if a=12, b=4, and c=8? (answered by checkley77,jim_thompson5910)
Given vectors a=3i - 2j and b=4i + 4j. Find 5a -... (answered by venugopalramana)
6a-{3b-6[a-(b+5a)]} (answered by unlockmath)
6a-3b+2(b+5a) (answered by fractalier)