Question

Selve each system of equations using substitution method.
c+6d=7
- c - 2d=-2
​

Answer 1

Step-by-step explanation:

c+6d= 7. equation 1

-c-2d= -2. equation 2

put c=7-6d in equation 2

-(7-6d)-2d= -2

-7+6d-2d = -2

4d = -2+7

4d= 5

d = 5/4

c= 7-6(5/4)

c= (7-30/4). ( Taking Lcm)

c= (28-30)/4

c= -2/4

c = -1/2