Answer:
explain
Step-by-step explanation:
Answer:
<em>12.99</em>
Step-by-step explanation:
<em>a²+b²=c²</em>
<em>a²+b²=c²√91²+√78²=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²c=√169</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²c=√169 =13</em>
Make the coefficient of y the same in both equations:
To do this, multiply equation one by 2, and equation two by 5 (this will make the coefficient 10 in both).
14x + 10y = 38
-35x - 10y = -80
Eliminate the y variable by adding the equations from each other
(14x + 10y = 38)
+ (-35x - 10y = -80)
= -21x + 0y = -42
We now have -21x = -42. The y variable has been eliminated.
Solve for x
-21x = -42
Divide both sides by -21 to get x on its own.
x = 2
Substitute x into the equation to find y.
7*2+5y=19
14+5y=19
Subtract 14 from both sides.
5y=19-14
5y=5
Divide by 5 on both sides to get y on its own.
y=5/5
y=1
The answer is (2,1)
So in a proportion you multiply, in this case you have to combine the z with the 3 to create 3z.
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