maths功課又碰壁...

Form2的maths題,有冇人識得計呀?

1) Solve the simultaneous linear eqt. for x and y in terms of p and q.
p(x-y)+q(x+y)=p²q
p(x+y)+q(x-y)=pq²

2) Solve the simultaneous linear eqt.
(-2)的x-y次方+1/2=0
4的x+y次方-64=0



請利用英文作答,並詳列步驟(最好有埋expression),thx~