x is the number of adults and y is the number of children.
x + y = 12
<span>14x + 10y = 140
lets multiply the first equation by -10 and then add it to the second equation:
-10x - 10y = -120
</span>14x + 10y = <span>140
</span>-----------------------
4x + 0 = 20
x = 20/4
x = 5
then substitute in the original equation:
x + y = <span>12
</span>5 + y = <span>12
</span>y = 12 - 5
y = 7
therefore there were 5 adults and 7 children
<em><u>The equation to find the length r of the red ribbon is:</u></em>
<em><u>Solution:</u></em>
Let "b" be the length of blue ribbon
Let "r" be the length of red ribbon
To find: equation for length r of the red ribbon.
The length of the blue ribbon is two - thirds the length of the red ribbon
Which means,
Therefore,
Thus the equation to find the length r of the red ribbon is found
open the parenthes. and then after that you'll get 27+12x-15. if you simplify that then you'll get 12x+12
Answer:
hello :
Step-by-step explanation:
here is the solution
Y= -5x+3 is the equation that is perpendicular to line AB with the point (1,-2)
