Answer:
x=-22
Step-by-step explanation:
6(x+15)=-42
6x+90=-42
6x=-132
x=-22
10,20,30,40,50,60,70,80,90,100,120
The first thing you must remember is that the product of matrices is done by multiplying rows by columns.
For this case, the AB matrix is
AB = [1 0 0; 0 1 0; (x + 1) 0 y]
Equalizing the identity matrix we have
AB = I
[1 0 0; 0 1 0; (x + 1) 0 y] = [1 0 0; 0 1 0; 0 0 1]
Therefore we have
x + 1 = 0
y = 1
The values of x and y are
x = -1
y = 1
the answer is
X=-1
Y=1
1.
3x + 3 = 21
3x = 21-3
3x = 18
x = 18/3
Therefore,
x = 6
So option ( B) is the correct one.
2.

Therefore option (B) is the correct one here too.
Multiply both sides by xyz

Collect like terms



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