exam Maths Puzzle Numerical Ability

use substitution to find the solution of each system

y=2x
y=-x+12

also

y=x-2
y=-x+6

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Genetic problems
6. Both Mrs. Smith and Mrs. Jones had babies the same day in the same hospital. Mrs. Smith took home a baby girl, whom she named Shirley. Mrs. Jones took home a b how would I graph y2=12x (is this a parabola?)