Question

Solve the following system of linear equations by substitution method, elimination method
and cross multiplication method
14. 11x + 15y + 23= 0 and 7x - 2y - 20 = 0
15. 2x + y = 7 and 4x - 3y + 1 = 0​

Answer 1

Answer:

14)elimination method

Given that 11x + 15y + 23 = 0, 7x − 2y − 20 = 0

2 × 11 x + 15y + 23 =0

⟹ 22x + 30y + 46 = 0

15 × 7x − 2y − 20 = 0

⟹ 105x − 30y − 300 = 0

adding both 127x − 254 = 0

⟹x=2

y=−3

Step-by-step explanation:

15)

Answer 2

Answer:

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