Question

iii) Evaluate: a) (y - 1) (2y2 - y2 + 5y - 3) - (4y - 9) (y2 – y + 3)
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Answer 1

Step-by-step explanation:

Complete the following activity to solve the simultaneous equations.

5x + 3y = 9 -----(I)

2x + 3y = 12 ----- (II)

ANSWER:

Disclaimer: There is error in the Q. In (II) there should have been 2x − 3y = 12

5x + 3y = 9 -----(I)

2x − 3y = 12 ----- (II)

Add (I) and (II)

7x = 21

x = 3

Putting the value of x = 3 in (I) we get

5(3)+3y=9⇒15+3y=9⇒3y=9−15=−6⇒y=−2

Thus, (x, y) = (3, −6).