Question

Para cada ecuación, selecciona que valor o que valores hacen que la expresión sea verdadera. Seleccione una:

6 + 2N = 26
b. N = 2
d. N = 0
a. N = 10
c. N = -10

3T + 2 = 10 - T
a. T = 2
d. T = -2
c. T = 5
b. T = 0

2(D + 1) - (D - 1) = 4
a. D = 2
c. D = 0,5
b. D = -3
d. D = 1

5 +2M + 2 = 3(M + 2) + 3
c. M = -1
b. M = 0,2
d. M = 8
a. M = -2

Answer 1

$6+2N=26\\2N=26-6\\2N=20\\N=20/2=10\\\\3T+2=10-T\\3T+T=10-2\\4T=8\\T=8/4=2\\\\2(D+1)-(D-1)=4\\2D+2-D+1=4\\D+3=4\\\\D=4-3=1$

$5+2M+2=3(M+2)+3\\7+2M=3M+6+3\\2M-3M=6+3-7\\-M=9-7\\-M=2\\M=2/-1=-2$