Question 943856

{{{x+y=24}}}...eq.1
{{{y=7x}}}.....eq.2
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{{{x+y=24}}}...eq.1 substitute {{{7x}}} for {{{y}}}

{{{x+7x=24}}}

{{{8x=24}}}

{{{x=24/8}}}

{{{highlight(x=3)}}}


{{{y=7x}}}.....eq.2 substitute {{{3}}} for {{{x}}}

{{{y=7*3}}}

{{{highlight(y=21)}}}



{{{ graph( 600, 600, -10, 10, -10, 30, 7x, -x+24) }}}