Lines y=√5·x+1 and y=2√5·x−1 intersect at what height above the x axis?
Options:
A) 3  B) √5  C) 3√5  D) 0  E) 5√5
Solve two equations for y   y=√5·x+1   y=2√5·x−1   Set the two equations equal to each other and solve for x   √5·x+1=2√5·x−1   2 = √5·x   2/(√5) = x   Plug x = 2/(√5) into any one of the original equations to find the y value (height above x axis) where the two lines intersect   y=√5·x+1   y=√5·(2/(√5))+1   y = 2 + 1= 
<gadget id="calculator">2 + 1</gadget>
<output>3</output>
3   Final answer:   3) 3
<result>A</result>
Lines y=√5·x+1 and y=2√5·x−1 intersect at what height above the x axis?