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Solve using augmented matrices. $\newline$ $7x - 8y = -9$ $\newline$ $y = 9$ $\newline$ (_, _)

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Solve a system of equations using substitution

Full solution

Q. Solve using augmented matrices.

\newline

7x - 8y = -9

\newline

y = 9

\newline

(_____, _____)

Substitute $y$ into first equation: Now, we need to solve for $x$ using the first equation since we already know $y = 9$ . Substitute $y = 9$ into the first equation: $7x - 8(9) = -9$ $7x - 72 = -9$ $7x = -9 + 72$ $7x = 63$ $x = \frac{63}{7}$ $x = 9$
Solve for x: We have found the values of x and y. $\newline$ $x = 9$ $\newline$ $y = 9$ $\newline$ The solution in the form of an ordered pair is $(9, 9)$ .

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