Question

me ajudem
use o método da substituição e resolva

x+y=1
3x-5y=-17

Answer 1

x=1 –y

3(1–y)–5y=–17
3–3y–5y=–17
–8y=–17–3 · (–1)
8y=20
y=20/8
y=5/2

x=1–y
x=1–5/2
x=(2–5)/2
x=–3/2
S={–3/2;5/2}