Question

if a7 is equal to 35 and a3=21 find d

Answer 1

Answer:

a7=a+6d

a+6d=35

6d=35-a : eq1

.

a3=a+2d

a+2d=21

2d=21-a : eq2

By elimination method: eq2 - eq1

2d=21-a

- (6d=35-a)

sign change

2d=21-a

-6d=-35+a

_________

-4d=-14

_________

d=-4/-14

ans=4/14

Answer 2

Answer:ANSWER IN THE ATTACHMENT.

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