Question

4x-5y=20 please solved the question
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Answer 1

Step-by-step explanation:

-1 xy = 20

-1 xy = 20xy = 20/-1

-1 xy = 20xy = 20/-1or

-1 xy = 20xy = 20/-1orWe think that x=2 , y=3

-1 xy = 20xy = 20/-1orWe think that x=2 , y=34×2 - 5×3 = 20

-1 xy = 20xy = 20/-1orWe think that x=2 , y=34×2 - 5×3 = 208 - 15 = 20

-1 xy = 20xy = 20/-1orWe think that x=2 , y=34×2 - 5×3 = 208 - 15 = 20-7 = 20

-1 xy = 20xy = 20/-1orWe think that x=2 , y=34×2 - 5×3 = 208 - 15 = 20-7 = 20=20/-7

Answer 2

Answer:

4x−5y−20=0

3x+5y−15=0

Δ=

∣

∣

∣

∣

∣

∣

4

3

−5

5

∣

∣

∣

∣

∣

∣

=35

Δ



=0

⇒Uniquesolution.