Answer:
2 Answers By Expert Tutors ... Let's set x = cost of books and y = cost of pens. ... In algebra, this can be written as x + y = 18. ... Using x and y, we get 1 book and 2 pens costs $21, or x + 2y = 21 ... The pen must cost $3 because we are adding $3 to the total when we ... Please provide a valid phone number.
Step-by-step explanation:
Your answer is 7.77777777778
(-oo, 42)
Mark brainliest
Hope this helps you
Graph that then it won’t let me send pic
Answer: It can be either one.
x=−3
or
x=−5
