=" What is the ange - setween the live "x+y=1" and "x-y=1?

What is the angle between the lines x+y=1 and x-y=1 ?

For what value of m are the three lines y=x+1, y=2(x+1) and y=mx+3 concurrent ?

If the regression coefficient of x on y and y on x are -(1)/(2) and -(1)/(8) respectively, then what is the correlation coefficient between x and y? -(1)/(4)

(dy)/(dx)+y/x=0 , where 'x' denotes the percentage population living in a city and 'y' denotes the area for living healthy life of population. Find the particular solution when x=100, y=1 .

If (x_1, y_1) be the centroid of the triangle formed by a line L and coordinate axes then equation of line L is (1) (3x)/(x_1)+(3y)/(y_1)=1 (2) xx_1+y y_1=3 (3) x/(3x_1)+y/(3y_1)=1 (4) x/(x_1)+y/(y_1)=1 (5) x x_1+y y_1=1

If [[x,y]]+[[3,4]]=[[2,-1]] then what are the values of x and y?