You can put this solution on YOUR website! Solve using the substitution method:
:
r = -3s; use this for substitution in the 2nd equation
:
r + 4s = 10
substitute -3s for r, then solve for s
-3s + 4s = 10
s = 10
find r using the 1st equation
r = -3s
substitute 10 for s
r = -3(10)
r = -30
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The solutions: r = -30, s = 10
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Confirm this in the 2nd equation
r + 4s = 10
substitute for r and s
-30 + 4(10) =
-30 + 40 = 10; confirms our solutions
