Question

solve the following equation by substitute method c 12x-16y=20; 6x+8x=30​

Answer 1

Step-by-step explanation:

12x-16y=20. .......... (1)

6x+8y=30. ........... (2)

Let's take equation no 2

6x+8y=30

6x=30-8y

x=30-8y/6

Put x in equation 1

12 (30-8y/6)-16y=20

360-96y/6-16y=20

360-96y-96y/6=20

360-192y=120

-192y=120-360

-192y= -240

Y= -240/-192

Y=1.25

Answer 2

Answer:

12x-16y=20 eq(i)

6y+8x =30 eq(ii)

Step-by-step explanation:

taking eq(I) you can take the other one to answer will come same from both

12x-16y=20

12x= 20 +16y

x= 20+16y/12 eq (iii)

putting eq( iii) in (ii)

8 × (20+16y) /12 + 6y = 30

160 + 128y+ 72y /12 = 30

160 + 200y =30 ×12

160 + 200y = 360

200y = 360-160

200y = 200

answer y =1

take eq(ii) and put the value of y you can take the other one to answer will come same from both

8x + 6×1 =30

8x. = 30-6

8x. = 24

x. = 24÷8

answer x. = 3