Answer:
the answer are x=4y-20
and x represents the independent variable and y represents the dependent variable
Negative 10 and positive 10
The angles of a triangle add to 180 degrees so the remaining angle must be 90°.
This triangle is half a square. It's one of the two tired triangles of trig, the other being half an equilateral triangle, 30°/60°/90°.
You need to show us the bar model