SOLUTION: The difference of two numbers is 20. the sum of three times the first and four times the second is 18. find the two numbers. So far this is what I have:
a-b=20
3a+4b=18
3(
Algebra.Com
Question 539309: The difference of two numbers is 20. the sum of three times the first and four times the second is 18. find the two numbers. So far this is what I have:
a-b=20
3a+4b=18
3(2)+4(3)=18 but 2-3 does NOT equal 20.
I'm not sure how to figure this out.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The difference of two numbers is 20. the sum of three times the first and four times the second is 18. find the two numbers. So far this is what I have:
a-b=20
3a+4b=18
3(2)+4(3)=18 but 2-3 does NOT equal 20.
I'm not sure how to figure this out.
------------------
Where did you get the 2 & 3?
--------------
a-b=20 --? a = b+20
3a+4b=18
3(b+20) + 4b = 18
3b+60 + 4b = 18
7b = -42
b = -6
-------
a = 14
RELATED QUESTIONS
The sum of five times a number and twice a second number is 18, but the difference of... (answered by stanbon)
The sum of two numbers is 20. The difference between three times the first number and... (answered by josgarithmetic,ankor@dixie-net.com,stanbon)
the difference of two numbers is 10. the difference of three times the first number and... (answered by josgarithmetic)
Half the sum of two numbers is 20 and three times their difference is 18. Find the... (answered by Maths68)
Three times a first number is 2 more than the opposite of a second number. The difference (answered by mananth)
The sum of four times the first number and three times the second number is 15. The... (answered by mananth)
the sum of two numbers is 59. the difference between 2 times the first number and 6 times (answered by jorel1380)
1. three times the difference between three times a number and three is twenty-seven.... (answered by Mathtut)
One number is four times another number. The greater of the two numbers is 20 less than... (answered by CharlesG2)