12×10+15y=390
120+15y=390
15y=270
y=18
So 18 adult t-shirts were sold
Jus plot the points in then draw a line through them.
I will attach a graph example of it
The slope is the rate of change
You can find it in two ways
1: visually, draw a triangle and count from vertically to horizontally
2: slope formula - I will show it this way
(Y2-y1)/(x2-x1)
Given points (3,12), (4,16)
(16-12)/(4-3) = 4/1 = 4
The slope is 4
The slope represents the $ per hour. In this case, the wage is $4 per hour.
Answer:
21.32
Step-by-step explanation: