Question 811963
Equation 1: {{{B = A + 4}}}
Equation 2: {{{3B + 4A = 61}}}
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Plug (A+4) into equation 2 for B.
Equation 2: {{{3B + 4A = 61}}}
{{{3*(A+4) + 4A = 61}}}
Multiply the 3 through.
{{{3A + 12 + 4A = 61}}}
Combine like terms.
{{{7A + 12 = 61}}}
Subtract 12 from both sides.
{{{7A = 49)}}}
Divide both sides by 7.
{{{highlight(A = 7)}}}
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Plug 7 into equation 1 for A.
Equation 1: {{{B = A + 4}}}
{{{B = (7) + 4}}}
{{{highlight_green(B = 11)}}}