exam Maths Puzzle Numerical Ability

How do i find y
in any linear equation.

for example
4a-7b=13
2a-7b=3

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exam Other Question

Use the quadratic formula to solve the following equations. Show all major steps involved and leave solutions in radical form (when applicable).
a: 4x^2 + 5x = 6
b: 2x^2 - 5x = Can someone help me on this?

What is the algebriac equation for:

A number less then 50 is 30

Thanks, Lisa