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
Answer:
25.60 €.
Step-by-step explanation:
£3 is €4
So £1 is €4/3
and £19.29 = 19.20 * 4/3
= 25.60 €
Answer:
b = 
Step-by-step explanation:
Given
y =
b + 10
Multiply through by 8 to clear the fraction
8y = 5b + 80 ( subtract 80 from both sides )
8y - 80 = 5b ( divide both sides by 5 )
= b
Answer:
p=£800
r=5%
t=3years
Step-by-step explanation:
simple interest=ptr/100=£800×5×3/100=£120