Asked by matt
A math contest consists of ten problems.Three points are given for each correct answer. One point is deducted for each incorrect answer. Andy answers all the problems and scores 18 points. How many correct answers does he have?
Answers
Answered by
rbowh
x = number of answers
y = number of incorrect answers
3 x - y = 18
x + y = 10
add the two equations and solve for x
check your answer
y = number of incorrect answers
3 x - y = 18
x + y = 10
add the two equations and solve for x
check your answer
Answered by
matt
How do you that rbowh? I am really bad at this.(step by step please)
Answered by
Ms. Sue
What part of the explanation don't you understand?
Answered by
matt
How to solve for x.(i am terrible at this)
Answered by
rbowh
what did you get when you added the two equations?
Answered by
matt
That is what I don't get.Please can you show me how to do it.
Answered by
rbowh
by the way, x represents number of correct answers - I left that out initially
Answered by
matt
Step by step is what I meant.
Answered by
rbowh
(3x - y) + (x + y) = 18 + 10
4 x = 28
x = ?
4 x = 28
x = ?
Answered by
matt
Thank you very kind sir/ma'am you were a big help.
Answered by
rbowh
You're welcome Matt.
Answered by
ANIKA
3*0=0
3*1=3
3*2=6
3*3=9
3*4=12
3*5=15
3*6=18
3*1=3
3*2=6
3*3=9
3*4=12
3*5=15
3*6=18
Answered by
sergio
3x+y=18
x+y=10
x=4
x+y=10
x=4
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