By what percent will a fraction change if its numerator is decreased by 10% and its denominator is decreased by 70%?

it will increase by 200%

Step-by-step explanation:

Lets call the original fraction x/y

and lets call the amount it was increased by a

which means that x/y multiplied by a = 0.9x/0.3y

because the numerator decreased by 10% and the denominator decreased by 70%

because of this you get the equation x/y * a = 0.9x/0.3y

you get xa/y= 0.9x/0.3y

you cross multiply and get the equation 0.3yxa=0.9yx

you cancel the yx from both sides and you're left with 0.3a=0.9

you solve the equation and get a=3

then you make the a percentage which is 300%

you subtract 100% because that is what you began with and get 200%

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

hm let me think hm think think hm think yes