write a system of equations and solvea class of 195 students went on a field trip. They took 7 vehicles,some cars and some buses. find the number of cars and number of buses they took if each car holds 5 students and each bus holds 45 students. 

[tex]c+b=7[/tex][tex]5c+45b=195[/tex][tex]c+b=7 [/tex] --> [tex] c=7-b[/tex][tex]5c+45b=195[/tex][tex]5(7-b)+45b=195[/tex][tex]35-5b+45b=195[/tex][tex]35+40b=195[/tex][tex]40b=160[/tex][tex]b=4[/tex][tex]c+(4)=7[/tex][tex]c=3[/tex][tex]cars:3 \\
buses:4[/tex]