exam Maths Puzzle Numerical Ability

Solving Linear Equations:
Use linear combinations to solve the system of linear equations.

t + r = 1
2r - t = 2

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exam Other Question

Write the equation of the line passing through (0, 9) and (1, 9).
Your equation should be in the form y = mx + b I need help solving the following equation:
x squared + 4x + 23 under the radical followed by +1=x