exam Maths Puzzle Numerical Ability

Can you please help me solve using the substitution method?

x + 7y = 16
-3x + 6y = 33

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exam Other Question

Good afternoon gang. Can anyone show me the steps and answer for this problem?

Find the GCF for this group of monomials.

16x�z, 40xz�, 72z�

Much appreciated. Determine which two equations represent perpendicular lines. (a)y=3/8x-4 (b) y=4x-3/8 (c) y=-1/4x+3/8 (d) y=1/4x-3/8