exam Maths Puzzle Numerical Ability

Hello

how do i solve the system by graphing:

x + y = 4
y = 2x + 1

thank you.

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exam Other Question

Ver confused with this one Solve sytem of linear equation express in ordered pai (x,y) if possible use substitution or addition method

x- 5/3y=7
4/7x + y=-13/7

thanks, please show me steps

dnn 1.3x squared-12x 2.2w squared-8w-10 3.4x squared-25