Question 896785
Assigning Variables:
L = 0.20 dollars per stamp
H = 0.30 dollars per stamp
C = $3.60,  the cost of mailing all the packages
u = count of the L stamps
v = count of the H stampes
u=-2+v, <i>number of .20 stamps was 2 less than the number of .30 stamps.</i>


The simpler equation can be restated as {{{v-u=2}}}.


Account for cost, C,
{{{(Lu+Hv)=C}}}


You can fill in the given values whenever you want, but your system of equations, using u and v as the UNKNOWN variables can be
{{{highlight(system(Hv+Lu=C,v-u=2))}}},
a system of two linear equations.