You take the first equation and make a value for y. So 6x + y =7 change it to :
y = -6x + 7
Now in the second equation replace the “y” with -6x +7 this is what it means to use substitution method . Your combined equation will now be :
8x + 9(-6x + 7) =17
Now do distributive property and you get :
8x + -54x +63 =17
Now combine like terms ;
-46x +63 =17
-46x =-46
x = 1
Now replace 1 for X value and we can get the value of Y .
Y=1
X=1
<span>(1/2) [SIN(X-Y)-SIN(X+Y)]= COS(X)SIN(Y)</span>
F(x)=3x2-11
f(5)=6-11
5f=-5
5f/5=-5/5
f=-1
Step-by-step explanation:
90 - 60 = 30
30 - 18 = 12
X=12
Answer:
12 hours :)
Step-by-step explanation: