Question 74141
Solving equations using more than one property. 3(r+4)=21, 3(r-4)=27
{{{3(r+4)=21}}}
{{{3(r)+3(4)=21}}}
{{{3r+12=21}}}
{{{3r+12-12=21-12}}}
{{{3r=9}}}
{{{3r/3=9/3}}}
{{{highlight(r=3)}}}
To check, let r=3 and see if both sides equal:
{{{3(3+4)=21}}}
{{{3(7)=21}}}
{{{21=21}}} We're right!!!!
:
{{{3(r-4)=27}}}
{{{3(r)+3(-4)=27}}}
{{{3r-12=27}}}
{{{3r-12+12=27+12}}}
{{{3r=39}}}
{{{3r/3=39/3}}}
{{{highlight(r=13)}}}
To check, let r=13 and see if both sides equal:
{{{3(13-4)=27}}}
{{{3(9)=27}}}
{{{27=27}}} We're right again!!!!
Happy Calculating!!!!