exam Maths Puzzle Numerical Ability

The dot product 3 1 4 x 2
-1
5 is:

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exam Other Question

Please help me solve these equations and plot there intercepts:
x+y=5
2x-y=4
x-y=5
3x+y=6
x-y=3 write the equation of the line with slope 5 and y-intercept (0,-3)

thanks for the help