Question

Solve: simultaneous equations 3x + 4y = 27 x + 4y = 17

Answer 1

Answer:

x = 5, y = 3

Step-by-step explanation:

Elimination method: (I will be eliminating 4y)

3x + 4y = 27 --- Equation 1

x + 4y = 17 --- Equation 2

Equation 1-2: 3x + 4y - x - 4y = 27 - 17

2x = 10

x = 10 ÷ 2

x = 5

Substitute x = 5 into Equation 2:

x + 4y = 17

4y + 5 = 17

4y = 17 - 5

    = 12

y = 12 ÷ 4

y = 3