Resolva os sistemas de equações a seguir pelo método da adição: a) 3x + y = 10
2x - 2y = 4

b) x + 2y = 9
3x + y = 7

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.

Find the axis of symmerty for x y=x squared -4x-8