12th grade maths
posted by adam .
just like to check if ive got these right. if not can you help??
make the subject (q)
p(q+r)=2(qp)
ans q=pr+2p/(2p)
make the subject (p)
p+3=qp+r/(2)
ans p=r6/(2q)
make the subject (r)
p(rq)=2+3(qr)
ans r=2+3q+pq/(p+3)
make the subject (x)
y=rqp/(x)
ans x=rqp/(y)

the second one:
make the subject (p)
p+3=qp+r/(2)
..is wrong,, must be:
ans: p=r6/(22q)
the third one:
make the subject (r)
p(rq)=2+3(qr)
..is lacking parenthesis,, must be:
ans: r=(2+3q+pq)/(p+3)
the last one is wrong,,
y=rqp/(x) *transpose r to left side
yr = qp/x *multiply both sides by x
x(yr) = qp *divide both sides by (yr)
x = (qp)/(yr)
so there,, =)