Question

-7x+8y=2 3x+6y=4 somebody fast ​

Answer 1

Step-by-step explanation:

Another solution is to let k=2y and get

x2+3xk+2k2+3x+3k=2

⟺(x2+2xk+k2)+(k2+3xk)+3(x+k)=2⟺(x+k)2+(x+k)(k+3)=2

So now we can let m=x+k and get

m(m+k+3)=2⟹(m,k)∈{(1,−2),(−1,−4),(2,−4),(−2,−2)}

Noting that k=2m−m−3 in our calculations. This gives (after dividing the solutions of k by 2 and putting x=m−k)

(x,y)∈{(3,−1),(3,−2),(6,−2),(0,−1)}

Answer 2

Answer:

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