二元一次方程怎么解(过程和答案都要)

Question

1.y/2+z/3=13 ① 2. x/4-y/7=1 ① 3.x-1.2y=2.4 ①
y/3-z/4=3 ② x/3+y/7=x/4 ② 0.5y=3x-2.5y ②

4.0.2x+0.5y=0 ① 5.x/2+y/3=2 ① 6.x+3/2+y+5/3=7①
5(x+1)-2(y+17)=0 ② 0.2x+0.3y=1.2 ② x+4/3-2y-3/5=2②

Answer 1

1.Y=18 Z=12