exam Maths Puzzle Numerical Ability

Please help me with this problem

SOlve by substitution:

b = -2c + 4
2c + b = 4

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exam Other Question

Identify the axis of symmetry, create a suitable table of values, and sketch the graph (including the axis of symmetry).

y=x� +6x - 2 evaluate x=-3 and y=-4 2xsquare - ysquare + 2xy