exam Maths Puzzle Numerical Ability

Please help me solve for a for this equation: {{{ 7.5a+.5b-3.5c=6.5 }}} {{{ 2.5a-3b+4c=5 }}} {{{ 1.5a-5b+2c=-11 }}}

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exam Other Question

How many lbs of Brazilian coffee costing $6.00 per lb must be mixed with how many lbs of columbian coffee costing $4.00 per lb to produce 36 lbs of a mixture costing $4.50 per lb? Can you please help me to write an equation for a direct variation with a graph that passes through these points: (9, -1)