A bicycle manufacturer builds racing bikes and mountain bikes. Materials for the racing bike cost $110 while labor to build them is $120. Materials for the mountain bike cost $140 and labor is $180. The company budgeted $31,800 for labor and $26,150 for materials. How many of each bicycle did they build?

3 answers

linear programming

https://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue
nr = number of racing bikes
nm = number of mountain bikes

lc = labor cost
lc = 120 nr + 180 nm
lc </= $31,800

mc = materials cost
mc = 110 nr + 140 nm
mc /= $26,150

sorry, do not need programming, nothing to maximize oer minimize, simple solution of two equations, two unknowns

120 nr + 180 nm = $31,800
110 nr + 140 nm = $26,150

solve for nr and nm
Ya but how would you solve for it using Substitution or Elimination?