exam Maths Puzzle Numerical Ability

3(12b + 6c) - 7(4b - 5c) simplify expression

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exam Other Question

Solve by the elimination method.

9x-9y=36

7y-3x= -14
What is the solution of the system?
Can someone explain this to me? I do not understand this at all...not of it. Write an equation in standard form of the line that passes through (7,-3) and has a y-intercept of 2.