Question

(I want real answers, if you give me a STEP BY STEP answer I'll give brainlyest)Solve each system of equations algebraically.

Answer 1

Answer:

Step-by-step explanation:

1) Make it so that it's easy to solve

3 = -y +2x

18 = y + x (the y cancels out)

21 = 3x (divide both sides by 3 to isolate x)

x = 7 (then you can plug in x and then solve for y)

2) Again, make the problem easy to read  

12 = -x + y

27 = 4x + 2y (get rid of either x or y. I am going to get rid of x by multiplying the top equation by four)

48 = -4x + 4y

27 = 4x + 2y  (x is canceled out)

75 = 6y (divide both sides by 6 to isolate y)

12.5 = y (then plug in y to find x)

3) 15 = (7 + p) + p -----------------> p represents pants and (7 + p represents shirts because she bought 7 plus pants of shirts)

15 = 7 + 2p

8 = 2p (isolate p by dividing by 2)

p = 4

- Elaine bought 4 pants and 11 shirts.

In the comments, let me know if you need a further explanation.