3. Write and solve the equation that represents the model below.

3x + 3y = x+ 7y is the equation and solutions are in bold below

subtract 3y from both sides

3x= x + 4y

subtract x from both sides

2x=4y

divide both sides by 2

x = 2y

Now we solve for y

3x + 3y = x+ 7y

2x=4y

0.5x = y

y = 0.5x or 1/2x

Step-by-step explanation:

rx and sx

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: