Seventy minus the product of 8 and a number is 86 as an equation

Hey there!!

Let us take the number as ' x '

7 - 8x = 56

-8x = 49

x = -49/8

Hope helps!

problem set up: 70-8x=86

70-8x=86

-70      -70

8x=16

8     8

x=2

Let us assume x is the increase percentage in decimals, then we need to multiply original value with 1+x.

Similarly if we assume x is the decrease percentage in decimals, then we need to multiply original value with 1-x

A) Given that sam multiplied original value with 1.07 while calculating percentage.

Since 1.07>1, that is an increase.

And percentage change = x*100 = (1.07-1) * 100 = 7 %

B)Given that sam multiplied original value with 0.7 while calculating percentage.

Since 0.7<1, that is an decrease

And decrease percentage = x*100 = (1-0.7)*100 = 30%