Solve the system of equations.

y = 2x

y = x2 - 15

two solutions : (-3; -6), (5; 10)

Step-by-step explanation:

hello:

the system is : y = 2x ... (*)

y = x2 - 15 ... (**)

put the value of y use (*) in (**):

2x = x² - 15

x²-2x-15 = 0

(x+3) (x-5) = 0

x+3 = 0 or x-5=0

x = - 3 or x = 5

case 1 : x = - 3 y = 2 (-3) = - 6

case 2 : x=5 y = 2 (5) = 10

two solutions : (-3; -6), (5; 10)