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3241004551 [841]
3 years ago
5

A particular chemistry book costs $6 less than a particular physics book, while two such chemistry books and three such physics

books cost a total of $123. Construct two simultaneous equations and solve them using the substitution method.
Mathematics
1 answer:
sladkih [1.3K]3 years ago
3 0

Answer:

Step-by-step explanation:

Let's say the Physics book costs $x

The Chemistry book will cost $x - $6

Two such Chemistry books will cost;

2($x - $6) = $(2x - 12)

Three such Physics books cost $3x

$(2x - 12) + $3x = $123

$5x - $12 = $123

$5x = $111

x = $22\frac{1}{5}

So the Physics book costs;  $22\frac{1}{5}

and the Chemistry book costs  $22\frac{1}{5} - 6 =  $16\frac{1}{5}

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