book Maths Puzzle Numerical Ability

i really need ur help solving this equation: 21x+3=121

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solve the system using the subsitutin method....-2x+y=6 and 4x-2y=5 how do i do this? directions: identify the vertex and intercepts without using a calculator.

i am not sure what i was suppose to do but i did the chart with the first column being X the midd