Question

1)Which of these systems of linear equations has an infinite number of solutions?

A)3x-8y=21
6x-16y=46
B)3x+6y=22
6x+12y=44
C)5x+7y=24
10x-14y=48
D)5x-9y=20
10x+18y=40

2)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
PLEASE HELPPPP

Answer 1

Answer: B

Explanation:

i took the test

Answer 2

1) B)3x+6y=22
6x+12y=44
because the equations are equivalent to each other
2*(3x+6y=22) -----> 6x+12y=44

2) 5x+10y=15 should be multiplied by -2, to get 5x*(-2)=-10x, and x then can be eliminated
A)-2