Which set of side lengths can form a triangle? a 6cm, 8cm, 18cm b 6cm, 8cm, 10cm c 6cm, 7cm, 14cm d 6cm, 7cm, 20cm

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.