Question

AYUDA CON LOS EJERCICIOS DE ALGEBRA DE MANCIL
8x+3y=5
7x-6y=1.5

10x-3y=16
4x-7y=18

Answer 1

8x + 3y = 5
7x - 6y = 1.5

8x + 3y = 5
3y = 5 - 8x

7x - 6y = 1.5
7x - 2(3y) = 1.5
7x - 2(5 - 8x) = 1.5
7x - 10 + 18x = 1.5
23x = 11.5
x = 0.5

3y = 5 - 8x
3y = 5 - 8(0.5)
3y = 5 - 4
3y = 1
y = 0,333...
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10x - 3y = 16
4x - 7y = 18

10x - 3y = 16
10x = 16 - 3y
x = (16 - 3y)/10

4x - 7y = 18
4(16 - 3y)/10 - 7y = 18
(64 - 12y)/10 - 7y = 18
(64 - 12y - 70y)/10 = 18
64 - 82y = 180
- 82y = 116
y = - 1.414

x = (16 - 3y)/10
x = (16 - 3(- 1.414))/10
x = (16 + 4.24)/10
x = 2.024