exam Maths Puzzle Numerical Ability

well it says solve by elimination, so could i have the slope of
6x-8y=40 5x+8y=48

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exam Other Question

A chemist needs 90 milliliters of a 78% solution, but has only 43% and 88% solutions available. Find how many milliliters of each should be mixed t oget the desired solution. solve each system of equations. Let z be the parameter
x+2y+3z=11
2x-y+z=2