Which set of sides will make a triangle?
a. 10 cm, 9 cm,9 cm
b. 4 cm,8 cm,14 cm
c. 13 cm,7 cm,6 cm
d. 6 cm,15 cm, 6 cm

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?