Question 171448
a) 2xsquared + 2ysquared = 18- no this is an equation for a circle.

b) x -y = 5 Yes ax+by=c  is the general linear equation therefor a=1 b=-1 and c=5
c) 2y - 3 = 7 yes a=0 y=3 and c =10


d) 3xy + 5 = 10 no