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?
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


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 = ?


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
Answered by sergio
3x+y=18
x+y=10
x=4
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