Question

Rozwiąż równania ,które są w załączniku:

Równań jest [5] ,dla tych ,którzy ogarniają powinny być miarę proste.
Z góry dziękuje i pozdrawiam!

Answer 1

A)  5x+3y=15
10x-6y=0

x+3/5 y = 3
10x - 6y = 0

x=3- 3/5 y
10x-6y=0

x=3 - 3/5
10(3= 3/5 y)-6y=0

x=3 - 3/5y
30-6y-6y=0

x=3 - 3/5y
30-12y=0

x=3 - 3/5y
-12y=-30

x=3 - 3/5y
y=30/12

x=3 - 3/5y
y=2   1/2

y= 2 1/2
x=3 - (3/5)*2 1/2

y= 2 1/2
x=3- 3/2 = 1  1/2

b) 7x-10y=3
2x-3y=6

7x-10y=3
x- 1 1/2y=3

7x-10=3
x=3+ 1 1/2y

x=3+ 1 1/2y
7*(3+1 1/2y)-10y=3

x=3+ 1 1/2y
21+21/2y = 10y =3

x=3+ 1 1/2y
21+ 1/2y=3

x=3+ 1 1/2y
1/2y = -18

x=3+ 1 1/2y
y = -36

y=-36
x- (1 1/2*(-36))=3

y=-36
x+54=3

y=-36
x=-51

c) 7x+4y=78
5x+7y=64

7x+4y=78
x+7/5y=64/5

7x+4y=78
x= 64/5 - 7/5y

x= 64/5 - 7/5y
7(64/5-7/5y)+4y=78

x= 64/5 - 7/5y
448/5 - 49/5y+4y=78

x= 64/5 - 7/5y
448/5- 4  49/5y=78

x= 64/5 - 7/5y
-4 49/5y=-10

x= 64/5 - 7/5y
y=-10:-69/5

x= 64/5 - 7/5y
y=10/69

y=10/69
x= 64/5 - 7/5 * 10/69

y=10/69
x=64/5-14/69

y=10/69
x=1856/345

d) 7x=5y
15y=28x-70

x=5/7y
15y=(28*5/7y)-70

x=5/7y
15y=20y-70

x=5/7y
-5y=-70

x=5/7y
y=14

y=14
x=5/7 * 14

y=14
x= 10

e)
1/2(x-3)+5/(8y)=0
x+1+y+1=xy+18,7

1/2x-1 1/2+5/(8y)=0
x+y+2=xy+18,7

x=xy+18,7 - y-2
1/2x-1 1/2+5/(8y)=0

x= xy+16,7-y
1/2(xy+16,7-y)-1 1/2 + 5/(8y)=0

x= xy+16,7-y
1/2xy+8,35-1/2y-1 1/2+5/(8y)=0

x= xy+16,7-y
1/2xy+6,85-1/2y+5/8y=0

x= xy+16,7-y
1/2xy+6,85-1/8y=0

x= xy+16,7-y
1/8y=-1/2xy-6,85

x= xy+16,7-y
y= (-1/2xy-6.85) * 8/1

x= xy+16,7-y
y=-4xy-54,8

y=-4xy-54,8
x=xy+16,7-(-4xy-54,8)

y=-4xy-54,8
x=xy+16,7+4xy+54,8

y=-4xy-54,8
x=5xy+71,5