Question

what is the answer of substitution method for 11x+15y+23=0; 7x-2y-20=0.​

Answer 1

Answer:

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