Solve the system by elimination.
x+ 5y = -1
5x + 15y = 5

The solution is ( , )

x=4, y=-1. (4, -1).

Step-by-step explanation:

x+5y=-1

5x+15y=5

-5(x+5y)=-5(-1)

5x+15y=5

-5x-25y=5

5x+15y=5

-10y=10

y=10/-10

y=-1

x+5(-1)=-1

x-5=-1

x=-1+5

x=4

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

addition

step-by-step explanation: