Question 1065824
{{{a}}}= number of lower vases, in $
{{{3a}}}= cost of {{{a}}} flower vases, in $
{{{10+3a}}}= cost of $10 worth of flowers plus {{{a}}} vases
{{{10+3a<=70}}} says that the cost of Christine's flowers and vases purchase
must be less than, or at most equal to {{{"$ 70"}}} .
Subtracting {{{10}}} from both sides of the inequalour
gives us an equivalent inequality:
{{{3a<=70-10}}} <---> {{{3a<=60}}}
Multiplying (or dividing) both sides by a positive number
gives us an equivalent inequality, so
{{{a<=60/3}}} <---> {{{highlight(a<=20)}}} .