exam Maths Puzzle Numerical Ability

Solve this system of linear equations by graphing 2x-y=4, 2x-y=6

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exam Other Question

Solve the following system of linear inequalities by graphing.
x + y < 5
0 <= y <= 3
x >= 1
What is the actual quadratic formula, and how would you actually get the quation itself? All formulas have a reason to how it was made. Such as, a stated theorem.

This is an any book question.