exam Maths Puzzle Numerical Ability

2x+3y=4

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Can you please help me solve by using the subtitution and elimination method (unless there is no infnite number or solution.)
y = 4 - x,
3x + 4y = 21 graph x + 2y< 3 with a line under the sign
2x-3y < 6 with a line under the sign please help me
thank you in advance