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(5(13/11) + 4(-19/11) = 65/11 - 76/11 = -11/11 = -1) ✔️
Directly use the equivalence (1\ \textkW·h=3.6\times10^6\ \textJ); multiply by 5.6.
(3(13/11) - 2(-19/11) = 39/11 + 38/11 = 77/11 = 7) ✔️
Determinant (\det(A)=3(4)-(-2)(5)=12+10=22).
The problem tests ability to (a) manipulate linear equations, (b) recognize when elimination yields fractional results, and (c) apply matrix inversion as an alternative verification.
(5(13/11) + 4(-19/11) = 65/11 - 76/11 = -11/11 = -1) ✔️
Directly use the equivalence (1\ \textkW·h=3.6\times10^6\ \textJ); multiply by 5.6. blueprint 4 workbook answer key
(3(13/11) - 2(-19/11) = 39/11 + 38/11 = 77/11 = 7) ✔️ (5(13/11) + 4(-19/11) = 65/11 - 76/11 =
Determinant (\det(A)=3(4)-(-2)(5)=12+10=22). blueprint 4 workbook answer key
The problem tests ability to (a) manipulate linear equations, (b) recognize when elimination yields fractional results, and (c) apply matrix inversion as an alternative verification.