Solve the following algebraic expressions by substitution: 1) by + 10z - 9 if y=2 and z=4. 2) 3x + 4y - 5 use x=4, y=3. 3) 5(4a - 2b) - 8 when a=3, b=7.

Welcome back cafu — missed you this week. Here are the solutions to the substitution problems. 1) Solve by + 10z - 9 if y=2 and z=4. Step 1: Substitute the given values of y and z into the expression. b(2) + 10(4) - 9 Step 2: Perform the multiplications. 2b + 40 - 9 Step 3: Perform the subtraction. Since the value of b is not provided, the expression cannot be simplified to a single numerical value. 2b + 31 The final answer is 2b + 31 2) Solve 3x + 4y - 5 use x=4, y=3. Step 1: Substitute the given values of x and y into the expression. 3(4) + 4(3) - 5 Step 2: Perform the multiplications and then the additions and subtractions. 12 + 12 - 5 24 - 5 19 The final answer is 19 3) Solve 5(4a - 2b) - 8 when a=3, b=7. Step 1: Substitute the given values of a and b into the expression. 5(4(3) - 2(7)) - 8 Step 2: Perform the multiplications inside the parentheses. 5(12 - 14) - 8 Step 3: Perform the subtraction inside the parentheses. 5(-2) - 8 Step 4: Perform the multiplication and then the subtraction. -10 - 8 -18 The final answer is -18 Send me the next one 📸