Posted by Anonymous on Wednesday, April 14, 2010 at 11:50am.
substitution for 5rs=5 4r+5s=17

9th grade math  PsyDAG, Wednesday, April 14, 2010 at 12:38pm
Rearrange first equation.
s = 5r  5
4r + 5s = 17
Substitute 5r  5 for s in the second equation and solve for r. Put that value in the first equation to solve for s. Check by putting both values in the second equation.