How many solutions does the following equations have?

one solution.: -6.5

Step-by-step explanation:

First you start with the side with parenthisis. So you multiply 7xY= 7y and then you multiply 7x3= 21 so you get 7y + 21 = 5y + 8

Second you subtract 8 from both sides.

7y + 21 = 5y +8

      -8  =       -8

wich leaves you with 7y + 13 = 5y

Next you want to subtract 7y from 5y because you cant have a variable on both sides.  7y + 13 = 5y

                   -7y + 13 = -7y which will leave you with 13= -2y

Now you divide each number by -2 to get "y" by itself.

13/-2 = -6.5 = y

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.