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