substitution for 5r-s=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.