two lines y=-2x+6 and y=1.5x+1 intersect. What is the size of the acute angle at the intersection?

Question

Ive got 59.4 degrees. Any confirmation/slight alteration?

Answer 1

are you using the formula found here

http://planetmath.org/encyclopedia/AngleBetweenTwoLines.html ?

then the two slopes are 1.5 and -2

and tanß = │(-2-1.5)/(1+(-2)(1.5))│
tanß = 1.75
ß = 60.26º