The cost of one ruler is $0.70
<h3>Applications of simultaneous equations </h3>
From the question, we are to determine the cost of one ruler
Let x represent the cost of a ruler
and
y represent the cost of a pen
From the given information, we can write that
y + x = $2.10 ----------- (1)
2y + 3x = $4.90 ----- (2)
From equation (1),
y + x = $2.10
Then,
y = $2.10 - x
Substitute this into equation (2)
2y + 3x = $4.90
2($2.10 - x) + 3x = $4.90
$4.20 - 2x + 3x = $4.90
$4.20 +x = $4.90
x = $4.90 - $4.20
x = $0.70
Hence, the cost of one ruler is $0.70
Learn more on Simultaneous equations here: brainly.com/question/26310043
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I'm so sorry, i don't know how it's called (because English isn't my native language) but there are angles that have the same value
maybe u'll tell me..
Answer:
Step-by-step explanation:
5k+ 6k+9k=20k
20k=£60
k=3£
£15, £18, £27
Answer
Step-by-step explanation:
4xc=4c
4x-2= -8
4c-8
