Register
4x+5y=3 -7x-6y=-19 To eliminate x we must find the least common multiple of 4 and 7 . What is it?
175k views
0 votes
4x+5y=3

-7x-6y=-19
To eliminate x we must find the least common multiple of 4 and 7 . What is it?

User Phuwin
by
8.1k points

1 Answer

3 votes
7 is prime so multiply them
4*7=28
answer is 28

anyway, multiply top by 7 and bottom by 4 to add to get

28x+35y=21
-28x-24y=-76 +
0x+11y=-55

11y=-55
divide by 11
y=-5
sub back
4x+5y=3
4x+5(-5)=3
4x-25=3
add 25
4x=28
divde 4
x=7

(7,-5)
User John Safranek
by
8.3k points
← Prev Question Next Question →

No related questions found

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Link Copied!