math_celebrity Administrator Staff member Dec 18, 2023 #1 Let a be the cost of the ball and b be the cost of the bat: We're given 2 equations: a + b = 1.10 b = a + 1 Substitute equation (2) into equation (1) for b: a + a + 1 = 1.10 Combine like terms: 2a + 1 = 1.10 Subtract 1 from each side: 2a + 1 - 1 = 1.10 - 1 2a = 0.10 Divide each side by 2: 2a/2 = 0.10/2 a = 0.05

Let a be the cost of the ball and b be the cost of the bat: We're given 2 equations: a + b = 1.10 b = a + 1 Substitute equation (2) into equation (1) for b: a + a + 1 = 1.10 Combine like terms: 2a + 1 = 1.10 Subtract 1 from each side: 2a + 1 - 1 = 1.10 - 1 2a = 0.10 Divide each side by 2: 2a/2 = 0.10/2 a = 0.05