selesaikan sistem persamaan linear 2 variabel berikut ini: a. y=-x+3 x=-x+5 b. x=2y + 10 2x+3y=-1 c. x+y=3 x-y=-3 d. 2x-4y=10 -12x+24y=-60

b ) x = 2y + 10
subtitusi
2x + 3y = - 1
2(2y + 10) + 3y = - 1
4y + 20 + 3y = - 1
7y = - 1 - 20
y = - 21 ÷ 7
y = - 3
subtitusi
x = 2y + 10
x = 2(-3) + 10
x = - 6 + 10
x = 4
hp = ( 4, - 3)

c) x + y = 3
x - y = - 3
----------------(-)
2y = 6
y = 3
subtitusi ke pers
x + y = 3
x + 3 = 3
x = 3 - 3
x = 0
hp = ( 0,3 )