Question

Sandra is selling red and yellow roses. On the first day she sold 4 red roses and 1 yellow rose for a total of $7. On the second day she sold 3 red roses and 1 yellow rose for a total of $6. What was the price of the two types of roses?


USE THE SUBSTITUTION METHOD PLEAAASSEEEE

PLEASSEEE EXPLAIN :)

Answer 1

4r +1y =7...eqn 1
3r+1y = 6...eqn 2
Make y subject of formula for eqn 2...
y = 6-3r...eqn 3
Subst eqn 3 into eqn 1...
4r +6-3r=7
r =1
Subst r=1 into eqn 3
y = 6-3=3
Red roses cost $1. each
Yellow roses cost $3 each