What function is graphed below?

y = 2x
y = x + 3
y = 2x + 3
y = 2x + 2

y = 2x + 3.

Step-by-step explanation:

The y-intercept is at (0, 3)  so we have y = mx + 3.

The slope = rise / run =  2/1 = 2 so m = 2.

answer: y = -12x + 108

step-by-step explanation: do (y = m x+b) formula.

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