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A tate government borrow $2,000,000 at imple annual interet. Some of the money i borrowed at 6%, ome at 7. 5%, and ome at 8. 5%. Ue a ytem of linear equation to determine how much (in dollar) i borrowed at each rate given that the total annual interet i $137,000 and the amount borrowed at 7. 5% i four time the amount borrowed at 8. 5%. Solve the ytem of linear equation uing matrice

Sagot :

By solving the linear matrices we got the values X = 1000000  , Y = 800000 ,  Z = 200000

What is an equation ?

According to algebra, an equation is a statement that shows the equality of two mathematical expressions. For instance, the equation 4x + 5 = 15 consists of the two equations 4x + 5 and 15, which are separated by the 'equal' sign.

According to the given information

X + Y + Z  =  2000000

0.07X + 0.085Y + 0.095Z = 157000

Y = 4Z

Y = 4Z is substituted into the first and second equations as follows:

X + 5Z = 2000000

0.07X + 0.085 (4Z) + 0.095Z = 157000

X = 2000000 - 5Z

0.07X + 0.435Z = 157000

0.07 (2000000 - 5Z) + 0.435Z = 157000

140000 - 0.35Z + 0.435Z = 157000

0.085Z + 140000 = 157000

0.085Z = 17000

Z = 200000

Y = 800000

X = 1000000

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