Find the values of a and b so that the solution of the linear system is (-9,1). ax + by = -31
ax – by = -41

Which of the following statements is not true? a. parallel lines are lines in the same plane that never intersect. b. congruent figures have the same shape and same size angles and sides. c. similar figures must have the same shape and the same size. d. a rotation is when you turn a figure around a certain point.

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb