Solve the system: 3x + 4y = -23 and 2y - x = -19. What is (x, y)?
A(9, -6)
B(-5, -2)
C(3, -8)
D(4, -6)
Answer & Solution
Correct answer: C. (3, -8)
From 2y - x = -19: x = 2y + 19. Substitute: 3(2y + 19) + 4y = -23 -> 6y + 57 + 4y = -23 -> 10y = -80 -> y = -8. Then x = 2(-8) + 19 = 3. Solution: (3, -8).
Related questions
Alma bought a laptop computer at a store that gave a 20 percent discount off its original Which of the following numbers is NOT a solution of the inequality 3x - 5 >= 4x - 3?Using a = 1052 + 1.08*t, at which of the following air temperatures will the speed of a soThe speed of a sound wave in air depends on the air temperature. The formula above (a = 10If y = kx where k is a constant, and y = 24 when x = 6, what is the value of y when x = 5?If (ax + 2)(bx + 7) = 15x^2 + cx + 14 for all x, and a + b = 8, what are the two possible If x > 3, which is equivalent to 1 / (1/(x + 2) + 1/(x + 3))?A line in the xy-plane passes through the origin and has slope 1/7. Which point lies on th