algebra substitution practice answers
2(7) - 3(2) = 14 - 6 = 8 Practice Problem 3 If x = 3y + 4, find the value of 5x - 2y when y = 2. Answer: Calculate x: x = 3(2) + 4 = 6 + 4 = 10 Substitute into 5x - 2y: 5(10) - 2(2) = 50 - 4 = 46 Practice Problem 4 Solve for z in the equation: z + 2x = 10, given x = 3.