Given a-2b=8, 4a+3b= 21; prove b= -1

please give a step by step answer

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

Your company withheld $4,463 from your paycheck for taxes. you received a $713 tax refund. select the best answer round to the nearest 100 to estimate how much you paid in taxes.

Ahighway between points a and b has been closed for repairs. an alternative route between there two locations is to travel between a and c and then from c to b what is the value of y and what is the total distance from a to c to b?