How do you solve #-5m+8=18# in two ways?

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Answer 1 · 2016-12-06T17:12:24

#m = -2#

1.) One way...

#-5m + 8 = 18#

Subtract both sides by 8.

#-5m + 8 - 8 = 18 - 8#
#-5m = 10#

Divide both sides by #-5#

#(-5m)/-5 = 10/-5#

#m = -2#

2.) Another way...

#-5m + 8 = 18#

Multiply both sides by #-1#

#(-1)*(-5m + 8) = (-1)*18#

#5m - 8 = -18#

Add both sides by 8.

#5m - 8 + 8 = -18 + 8#
#5m = -10#

Divide both sides by 5.

#(5m)/5 = (-10)/5#

#m = -2#