Consider the system of linear equations. 5x+10y=15 10x+3y=13 To use the linear combination method and addition to eliminate the
x-terms, by which number should the first equation be multiplied?
A- -2
B- -1/2
C- 1/2
D- 2
2 answers:
Answer:
A: -2
Step-by-step explanation:
You want some factor k such that k(5x) +(10x) = 0. That is, 5k+10 = 0. The solution to this is k=-2, corresponding to selection A.
k = -2 for sure
I normally multiply 5x+10y=15 by -2 to cancel out the x's.
This is because you can only solve the problem if one of your variables is canceled out and then you solve!
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Answer:
-7a+11
Step-by-step explanation:
The answer is A. 42
Solution:
Let x= ones digit, y=tens digit
1st condition (original number) : 7(x+y)=10y + x
2nd condition (new number by reversing the digits): 18+x+y=10x+y
simplifying:
1st condition: 6x=3y
2nd condition: x=2
substituting x=2 to 6x=3y
<span>y=4</span>
Answer:
the answer is 'C' bacause you have to multiplied between them
Answer:
Interest wil be 10% of 100 which is 10
So,
interest will be Rs.10
and total amount to be payed will be 100+10 which is Rs.110
I think is c I'm sorry if is wrong
