4x-7y=3
x-7y=-15
solve with process of elimination

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.