Rozwiąż układy równań metodą podstawiania: a) 3x - y = 2 x - y = 1   b) 2x - 6x = - 4 3y - 5x = - 6   c) x - 2y = 5 x + y = 26   d) 2x + y = 7 5x - 2y = 4   e) x - 3y = 5 4x + 5y = 1   Proszę o szybką pomoc (zadane na jutro). DAJE NAJ. !!!! ; )

a) {3x - y = 2 {x - y = 1     --- {y=3x-2 {x-3x+2=1 --- {y=3x-2 {-2x=-1 --- {y=3x-2 {x=1/2 --- {y=3*1/2 -2 {x=1/2 --- {y=3/2 - 6/2 {x=1/2 --- {y=-3/2 {x=1/2 ============= b) {2x - 6x = - 4 {3y - 5x = - 6 --- {-4x=-4 {3y=5x- 6 --- {x=1 {3y=-1 --- {x=1 {y=-1/3 =================== c) {x - 2y = 5 {x + y = 26 --- {x=5+2y {5+3y=26 --- {x=5+2y {3y=21 --- {x=5+2y {y=7 --- {x=5+2*7 {y=7 --- {x=5+14 {y=7 --- {x=19 {y=7 =================== d) {2x + y = 7 {5x - 2y = 4 --- {y=7-2x {5x-14+4x=4 --- {y=7-2x {9x=18 --- {y=7-2x {x=2 --- {y=7-2*2 {x=2 --- {y=3 {x=2 =================== e) {x - 3y = 5 {4x + 5y = 1 --- {x=5+3y {20+12y+5y=1 --- {x=5+3y {17y=-19 --- {x=5+3y {y=-19/17 --- {x=85/17 - 57/17 {y=-19/17 --- {x=28/17 {y=-19/17