9th grade
posted by Anonymous
substitution for 5rs=5 4r+5s=17

PsyDAG
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.
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