Friday

October 31, 2014

October 31, 2014

Posted by **Sara** on Saturday, December 8, 2012 at 8:32am.

- Algebra -
**Reiny**, Saturday, December 8, 2012 at 10:37amI think you have a typo and you should have 12t in the first equation

If so, then drwls made the following observation

http://www.jiskha.com/display.cgi?id=1282324238

- Algebra -
**khan**, Saturday, December 8, 2012 at 11:43pm8s+12=16............. equation 1

6s+9t=12............. equation 2

Multiply equation 1 by 3 and equation 2 by 4 and subtract.

+24s+36= +48

+24s+36t=+48

- - - (sign will change when sub)

.............

36-36t=0

t=1

put t=1 in equation 2

6s+9(1)=12

s=1/2

CHECK 6(1/2)+9(1)=12

12=12

LHS=RHS so your answer is correct

**Answer this Question**

**Related Questions**

algebra - i need help with these problems (either a solution or how to plug them...

Substitution Method-Plz help - Use the Substitution method to solve the system ...

math - solve each system of equations by substitution. y=3x-9 please help ...

Algebra - Can someone please help solve this? Solve by using addition or ...

substitution method - Solve by substitution method please help me solve this. I ...

algebra 1 - Solve the Foll by substitution x=1/5y 3x+2y=26 So, substitute 1/5y ...

Algebra - Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your ...

algebra 2 - 4p + 2q = 8 and q = 2p +1 solve by substitution

Algebra 1 - Solve by substitution 2x+3y=40.50 3x+y=38.00

algebra - solve by substitution 2x+6y=30 -9x+y=61