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x=1-2y 4x+21.5=17
4(1-2y)+5y=17 4x=17-21.5
4-8y+5y=17 4x=-4.5
-8y+5y=17-4 x=-4.5/4
-3y=13 x =1.125
y=13/-3
y=4.3
1) - 2x + y = 2
2) 4x + 5y = 17
Despejo y en 1.
- 2x + y = 2
y = 2 + 2x
Sustituyo y en 2.
4x + 5y = 17
4x + 5 (2 + 2x) = 17
4x + 10 + 10x = 17
10x + 4x = 17 - 10
14x = 7
x = 7/17
x = 1/2
Sustituyo en valor de x en el despeje de y.
y = 2 + 2x
y = 2 + 2 (1/2)
y = 2 + 2/2
y = 2 + 1
y = 3
Solución :
x = 1/2
y = 3