Give one word for plants with soft perishable stem .

The answer is 'herbaceous'. These are plants with soft and green stems that typically grow fast and usually don't live beyond one year (annuals). So they would produce flowers and seed within one season and then die.These sorts of plants have adapted to take advantage of the growing season while not persisting through the non-growing season.

i think you just have to substitute x into. the equation given

whereas, y= 6(1) -4

y=2

and so on. i hope this helps :)