Respuestas
Respuesta dada por:
1
1)(4x + 2y = 16)*2
3x - 4y = 7
-----------------------
8x + 4y = 32
3x - 4y = 7
-----------------------
11x = 39
x = 39/11 ≈ 3.5454
y = 10/11 ≈ 0.9090
2) 4x + 2y = 16 (4x = 16 - 2y)/2
2x = 8 - y
x = (8 - y)/2
3x - 4y = 7 (3x = 7 + 4y)
x = (7 + 4y)/3
Ahora igualamos las "x"
(8 - y)/2 = (7 + 4y)/3
24 - 3y = 14 + 8y
10 = 11y
y = 10/11 ≈ 0.9090
para hallar "x" reemplazamos en una de las y:
x = (8 - (10/11))/2
2x = (88 - 10)/11
2x = 78/11
x = 78/22
x = 39/11 ≈ 3.5454
3)4x + 2y = 16 (4x = 16 - 2y)/2
2x = 8 - y
x = (8 - y)/2
3x - 4y = 7
(3(8-y)/2) - 4y = 7
(24 - 3y)/2 - 4y = 7
(24 - 3y - 8y)/2 = 7
24 - 11y = 14
10 = 11y
y = 10/11 ≈ 0.9090
x = (8 - (10/11))/2
2x = (88 - 10)/11
2x = 78/11
x = 78/22
x = 39/11 ≈ 3.5454
3x - 4y = 7
-----------------------
8x + 4y = 32
3x - 4y = 7
-----------------------
11x = 39
x = 39/11 ≈ 3.5454
y = 10/11 ≈ 0.9090
2) 4x + 2y = 16 (4x = 16 - 2y)/2
2x = 8 - y
x = (8 - y)/2
3x - 4y = 7 (3x = 7 + 4y)
x = (7 + 4y)/3
Ahora igualamos las "x"
(8 - y)/2 = (7 + 4y)/3
24 - 3y = 14 + 8y
10 = 11y
y = 10/11 ≈ 0.9090
para hallar "x" reemplazamos en una de las y:
x = (8 - (10/11))/2
2x = (88 - 10)/11
2x = 78/11
x = 78/22
x = 39/11 ≈ 3.5454
3)4x + 2y = 16 (4x = 16 - 2y)/2
2x = 8 - y
x = (8 - y)/2
3x - 4y = 7
(3(8-y)/2) - 4y = 7
(24 - 3y)/2 - 4y = 7
(24 - 3y - 8y)/2 = 7
24 - 11y = 14
10 = 11y
y = 10/11 ≈ 0.9090
x = (8 - (10/11))/2
2x = (88 - 10)/11
2x = 78/11
x = 78/22
x = 39/11 ≈ 3.5454
yulio1234:
pero en metodode igualacion
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