The length of a side of a square is 3x plus 4 ft. If its a perimeter is 100 ft, what is the value of x?

x=7

Step-by-step explanation:

4 (3x+4)= 100 ft (Perimeter = sum of all 4 sides)

12x + 16 =100 ft (Multiply length of one side by 4, which is number of side on a square)

12x = 84 (This is what is left after subtracting 16 form both sides of the equation making the equation still true)

x = 7 (84 divided by 7 to let X stand alone and get the value of x)

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4