substitution for 5r-s=5 -4r+5s=17

1. 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.

posted by PsyDAG

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