Question

se z + y = 10 e x-y=6, entao o valor numerico de 2x-3y e (A)15(B)30(C)22(D)40(E)10

Answer 1

x+y=10
x-y=6

x=10-y

10-y-y=6
10-2y=6
2y= 6-10
2y= -4
y= -2


x-(-2)=6
x+2=6
x=4


2.4-3(-2)= 8+6= 14