Решите систему уравнений методом подстановки: 1) {x=y+2 {3x-2y=9 2) {y=x+1 {5x+2y=16

Question

Решите систему уравнений методом подстановки:
1) {x=y+2
{3x-2y=9
2) {y=x+1
{5x+2y=16

Answer 1

1) {x=y+2
{3*(y+2)-2y=9
3y+6-2y=9
y=3.
x=3+2=5.
2) y=x+1
5x+2y=16
5x+2*(x+1)=16
5x+2x+2=16
7x=14
x=2
y=2+1=3.

Comments

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