Respuesta:
a) (3; 1)
b)(1; 2)
Explicación paso a paso:
a) 1) 4x -2y = 10 2) 5x + 2y = 17
Despejo x
4x = 10 + 2y 5x = 17 - 2y
x = [tex]\frac{10+2y}{4}[/tex] x = [tex]\frac{17-2y}{5}[/tex]
igualo las x
[tex]\frac{10+2y}{4}[/tex] = [tex]\frac{17-2y}{5}[/tex] Multiplico en cruz
5(10 + 2y) = 4(17 - 2y)
50 + 10y = 68 - 8y
10y + 8y = 68 - 50
18y = 18
Y = 1
Sustituyo Y en 1)
x = [tex]\frac{10+2y}{4}[/tex] = [tex]\frac{10+2(1)}{4}[/tex] = [tex]\frac{12}{4}[/tex] = 3
x = 3
b) 1) -8x + 3y = -2 2) 5x - 4y = -3
despejo y
3y = -2 + 8x -4y = - 3 - 5x
Y = [tex]\frac{8x- 2}{3}[/tex] y = [tex]\frac{5x+3}{4}[/tex]
igualo Y
[tex]\frac{8x- 2}{3}[/tex] = [tex]\frac{5x+3}{4}[/tex] Multiplico en cruz
4(8x - 2) = 3(5x + 3)
32x - 8 = 15x + 9
32x - 15x = 9 + 8
17x = 17
x= 1
Sustituyo en 2)
y = [tex]\frac{5x+3}{4}[/tex] = [tex]\frac{5(1)+3}{4} = \frac{8}{4}[/tex] = 2
Y = 2
Saludos
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Respuesta:
a) (3; 1)
b)(1; 2)
Explicación paso a paso:
a) 1) 4x -2y = 10 2) 5x + 2y = 17
Despejo x
4x = 10 + 2y 5x = 17 - 2y
x = [tex]\frac{10+2y}{4}[/tex] x = [tex]\frac{17-2y}{5}[/tex]
igualo las x
[tex]\frac{10+2y}{4}[/tex] = [tex]\frac{17-2y}{5}[/tex] Multiplico en cruz
5(10 + 2y) = 4(17 - 2y)
50 + 10y = 68 - 8y
10y + 8y = 68 - 50
18y = 18
Y = 1
Sustituyo Y en 1)
x = [tex]\frac{10+2y}{4}[/tex] = [tex]\frac{10+2(1)}{4}[/tex] = [tex]\frac{12}{4}[/tex] = 3
x = 3
b) 1) -8x + 3y = -2 2) 5x - 4y = -3
despejo y
3y = -2 + 8x -4y = - 3 - 5x
Y = [tex]\frac{8x- 2}{3}[/tex] y = [tex]\frac{5x+3}{4}[/tex]
igualo Y
[tex]\frac{8x- 2}{3}[/tex] = [tex]\frac{5x+3}{4}[/tex] Multiplico en cruz
4(8x - 2) = 3(5x + 3)
32x - 8 = 15x + 9
32x - 15x = 9 + 8
17x = 17
x= 1
Sustituyo en 2)
y = [tex]\frac{5x+3}{4}[/tex] = [tex]\frac{5(1)+3}{4} = \frac{8}{4}[/tex] = 2
Y = 2
Saludos