exam Maths Puzzle Numerical Ability

What are lines that have the produce of -1 as their slopes?

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exam Other Question

Graph the equations of inequalities.
x + 2y <_4
2x + y <_4
x >_ 0
y >_ 0
will someone please help me with this?? sorry i cant seem to figure this one out
SOLVE FOR X

0.05x+0.065(5000-x)=295

THANKS ALOT