Question 374745
Let T be the cost of a tennis ball, G the cost of a golf ball. 
{{{4T+3G=1025}}}
{{{2T+5G=1125}}}
Multiply eq. 2 by (-2) and add to eq. 1,
{{{4T+3G-4T-10G=1025-2250}}}
{{{-7G=-1225}}}
{{{highlight(G=175)}}}
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Then use either equation to solve for T.
{{{4T+3(175)=1025}}}
{{{4T=1025-525}}}
{{{4T=500}}}
{{{highlight(T=125)}}}
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Tennis balls are $1.25 and golf balls are $1.75 each.