Using the rule for 2x2 matrices,

the determinant for your matrix is
123453242463563276890798765432
its -2
Answer/Step-by-step explanation:
Given:
-x + 3x + 1 + 4(x + 2) = 54
To solve, first open the bracket by applying the distributive property. Multiply every term you have in the bracket by 4
-x + 3x + 1 + 4x + 8 = 54
Add like terms together
6x + 9 = 54
Subtract 9 from each side
6x = 54 - 9
6x = 45
Divide both sides by 6
x = 45/6
x = 7.5
Answer:
9, -4, 3b, and 7a
Step-by-step explanation:
Answer:
7 days
Step-by-step explanation: