5-a/8=4/7 solve for a show your work

Subtract 5 from both sides
a/-8 = 4/7 - 5

simplify 4/7 - 5 to 31/-7
a/-8 = 31/-7

multiply both sides by 8 
-a = 31/-7 x 8

simplify 31/7 x 8 to 248/7
-a = 248/7

multiply both sides by -1.
The answer is a = 248/7

The words are the explanations of the steps and the dark bolded words are the work shown for each step.

both due 2 rule.

The √42 is a rational number if 42 is a perfect square. It is an irrational number if it is not a perfect square. Since 42 is not a perfect square, it is an irrational number. This means that the answer to "the square root of 42?" will have an infinite number of decimals. The decimals will not terminate nd u cannot make it into an exact fraction.

√42 is an irrational number

tnx