in the coordinate plane , line a has a slope of - 1 and an x - intercept of 1 . line b has a slope of 3 and a y - intercept of - 3 . if the two lines intersect at the point ( a , b ) , what is the sum a + b ?
"the equation of line a is y = - x + 1 the equation of line b is y = 3 x - 3 3 x - 3 = - x + 1 x = 1 y = 0 the point of intersection is ( 1,0 ) and then a + b = 1 . the answer is b ."
divide(subtract(subtract(3, 3), 1), 1)