7 tenths means 0.7
we want 9 times as much as 7 tenths. This means that we will multiply the 7 tenths by 9 to get the answer.
This will give us the following result:
0.7 x 9 = 6.3
Therefore: 9 times as much as 7 tenths is 6.3
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I hope u know the point -slope form
,here, the equation will be
y+3= -6x -54
Looking at these two equations, you need to cancel out the variables with powers and the z. This can be simply done by adding them.
9y-2y^2+3z^2=867
+
9x+2y^2-3z^2=132
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9y+9x=999
Factor the 9 out of the left side.
9(x+y)=999
x+y=111
The answer is C (111).