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Hanna Nelson
Mathematics
Today, 05:59
Solve the system of equations.
y = 2x
y = x2 - 15
+4
Answers (
1
)
Alexia Dalton
Today, 06:14
0
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)
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