exam Maths Puzzle Numerical Ability

Solve for y:

3x+2y=12

Is it y=-3x+6

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exam Other Question

How many gallons of cream that is 22% butterfat must be mixed with milk that is 2% buttermilk to get 20 gallons of milk containing 4% buttermilk? What is the y value of the y-intercept for the graph of the equation

-4x+5y=9?

Is it 9/5