exam Maths Puzzle Numerical Ability

-2m+3=-5m-30

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exam Other Question

Y=p-(x+q)^ crosses the y-axis at the point (0,1) and x axis at (4,0) find the value of p and q [PS: ^=2] 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