exam Maths Puzzle Numerical Ability

The problem is:

A real estate agent recieves a monthly salary of $1500 plus a 4% commision on every home sold. For what amount of monthly sales will the agent earn at least $5000?

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exam Other Question

Given: angle DEG = (x +3y)
angle GEF = (2x+y)
angle DEF is a right angle

a. solve for y in terms of x
~My answer= I HAVE NO CLUE AS TO SOLVING THIS S Help me please!! I dont understand how to do this with a fraction:

4a+3/4=19/4