Aline passes through the point (10,-1) and has a slope of -1/2

with a point given and the slope , you can find the the line, of this form,  THE EQUATION POINT SLOPE IS

Y-Y1= M(X-X1)  , Y-(-1) = -1/2( X- 10),   Y+1 = -1/2X+ 5, Y = -1/2 X +5 -1,  Y = -1/2X+ 4

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.