Chapter 6, Problem 1P

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Practice Exercise 201 Further problems on solving simultaneous equations using matrices (answers on page 1133) In Problems 1 to 5 use matrices to solve the simultaneous equations given. 1. 3x+4y=0 2x+5y+7=0 2. 2p+5q+14.6=0 3.1p+1.7q+2.06=0 3. x+2y+32=5 2x-3y-z=3 -3x+4y+5z = 3 4. 3a4b3c=2 -2a+2b+2c=15 7a-5b+4c 26 === 5. p+2q+3r+7.8=0 2p+5q r 1.4=0 5p q+7r 3.5=0 6. In two closed loops of an electrical circuit, the currents flowing are given by the simultaneous equations: 11+2/2+4=0 511 +32 1 0 Use matrices to solve for 1 and 12