Explain how knowing 1+7 you find the sum for 7+1

Solve the system of equations. y= 2x y= x^2 - 15

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Give the functions f(x) = |x + 2| - 3, what is the domain? a, b,c, or d all real numbers x > 2 x < -2 all real numbers and x cannot equal to 2