Question

Find the values of a and b given that (2,b) is the solution of the simultaneous equations ax - y = 7 and 4x + 2y = a. Note! The elimination method makes this a simple process!

Answer 1

Answer:

a = 2, b = -3

Step-by-step explanation:

4x + 2y = a

4× 2 + 2× b = a

2b + 8 = a. eq. 1

ax - y = 7

(2b + 8)2 - b = 7

4b + 16 - b = 7

4b - b = 7 - 16

3b = -9

b = -9/3

b = -3

4x + 2y = a

4× 2 + 2 × -3 = a

8 - 6 = a

2

a = 2

Answer 2

Answer:

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