Question

8. Daca x = 5 si a + b = 13, calculati
a) 3x + 7. at 7 b
b)x•a+x•b-50

Answer 1

a.) 3x+7= 3×5+7= 35+7= 42

b.) x•a+ x•b-50= x(a+b)-50= 5×13-50= 65-50= 15

Answer 2

Explicație:

a+b=7 => a=7-b

a) 3x-7= 5•3+7= 15+ 7=22

b) 5•a+5•b -50= 5(a+b) -50= 5•13-50= 65-50= 15