Systems of equations

Question

A local shop is selling special candy bars. Mary bought 1 silver wrapped chocolate bar and 3 gold wrapped chocolate bars for $11. Juan was also buying some at the same time. He bought 1 silver wrapped chocolate bar and 4 gold wrapped chocolate bars and spent $14. How much is each bar, ignoring sales tax?

A. $3 silver bars, $2 gold bars.

B. $4 gold bars, $3 silver bars.

C. $2 silver bars, $4 gold bars.

D. $2 silver bars, $3 gold bars.

Answer 1

S+3G=11

S+4G=14

G=14-11 = $3

S= 11-3(3) = $2

Answer is D

$2 + 3($3) = $2 + $9 = $11