Question

o valor da expressao 15+5y+2ay+6a,onde.3+y=-7 e 5+2a=10 é:

Answer 1

15+5y+5ay+6a                                                  3+y=-7               5-2a=10 15+5.-10+2.2,5-10+6.2,5                                 Y=-7-3               2a=10-5  15+(-50)+5.-10+15                                            Y=-10                  2a=5   (-35)+(-50)+15                                                                               a=5/2    -85+15                                                                                              a=2,5     R:-70