3. Your students have been working on expanded notation. One example you could give to your students would be:
ООО O
A) 34 = 3.4 x 10 + 1
B) 34 = 4 tens and 3 ones
C) 34 = 1 + 1 + 1 + 10 + 10
D) 34 = 10 + 10 + 10 + 1 + 1 + 1 + 1

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.