exam Maths Puzzle Numerical Ability

do I multiply entire equation by lcd even though it is only a subtraction question?

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exam Other Question

what does the y stand for in this equation

3y+6=13
You have to solve the systems of linear inequalities by graphing.

1) y < 6 2) x + y < 2 3) x < 7 4) y < -5x + 6
y > 3 x + y > 5