Find the slope of equation 21x+7y+14=0?

Can someone answer these problems for me

225/100 of last years cost. write each fraction as a decimal and as a percent

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.