2nd equation: 8 x-y=10 ⇒ y= 8 x-10 We will switch that in 1st equation: 8 x-10=x²+12 x+30, or: x² + 4 x +40 = 0, a=1,B=4, c=40 Discriminant : D= b² - 4 ac= 16 - 160 = -144 and because it is negative there are no real solutions. D)
36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)