Posted by SAP on Thursday, September 30, 2010 at 8:02pm.
Solve by elimination method. Please show step by step process.
7r4s=7
4r+7s=61

Math need by 9pm cst  bobpursley, Thursday, September 30, 2010 at 8:05pm
multiply the top equation by 7, and the bottome equation by 4.
Then add the equations, which will eliminate the s variable.
I will be happy to critique your work

Math need by 9pm cst  SAP, Thursday, September 30, 2010 at 9:11pm
7r4s=7 (7)
4r+7s=61 (4)
49r  28s = 49
16r + 28s = 244

65r = 195
195/65 = 3 (simplified) (3, is the first number of the ordered pair.)
Now this is the part that I get lost on. I know I am suppose to substitute 3 into one of the equations above, but how do I determine which one. So if I substitute 3 into the 1st equation:
7(3)4s= 7
21  4s= 7

21 = 7 would my answer be 7/21
Substitute 3 into the 2nd equation:
4(3)+7s = 61
12 + 7s = 61

12 = 61 would my answer be 61/12
(3, is the first number of the ordered pair.)
(3,7/21) or (3,61/12) which ordered pair is correct?
Answer This Question
Related Questions
 Math need by 9pm cst  Solve by substitution method. Show step by step process. ...
 Math need by 9pm cst  Solve. Please show step by step process. 5/8 x+1/16 x=11/...
 Algebra  How do I solve for the elimination method: 5x + 3y= 7 and 7x  2y =13...
 math  Please solve the system with the elimination method. Explain each step as...
 Algebra 2  I need step by step on how to solve this problem plz help I've been ...
 math  solve by the elimination method: 9x9y=18 7y3x=8 please solve step by ...
 algebra  Solve by the elimination method. x+4y=45 x+4y=27 please step by step
 Algebra 1StepbyStep  Can someone show me how to solve these stepbystep? ...
 Math  Solve by elimination: 5x+7y=77 , 5x+3y=53 can you please help me out step...
 alg2 check?  solve: 2x+2(x+3)=2(x+7) what I got was x=4 but I really think I ...
More Related Questions