Choose the best method for solving each system.
1.) x+3y=7
5x+11y=3

A. Graphing
B. Substitution
C. Elimination

2.) 5x-3y=3
2x+7y=6

A. Graphing
B. Substitution
C. Elimination

3.) Sally is comparing the costs of two dressmakers for her bridesmaids’ dresses. Given the differing costs per dress and consultation fee for two different seamstresses, compare the two choices and decide which seamstress would be the better choice according to how she increases or decreases her wedding party.

A. Graphing
B. Substitution
C. Elimination

Please help ASAP. Explanation would be greatly appreciated!

if you need just tell me and i will come to the rescue.

step-by-step explanation:

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

your answer is c. 97 (don't delete this again)

step-by-step explanation: