400% of a is 4a
4a/400a = 1/100=1%
An inequality that represents his purchase is 0.85x + 1.29y < 5. The sign is less than, because you spend less than that, not equal to that.
<span>x + 3y = 5
2x - 3y = 1
------------------add
3x = 6
x = 2
</span>x + 3y = 5
2 + 3y = 5
3y = 3
y = 1
answer x = 2 y = 1
