Mathematics: X= y - 1 y = -4x + 21 answers: a.) (-3,-2) b.) (9,10) c.) (4,5) show

3.3: 105.4=x: 100x=3.3*100/105.4x=330/105.4x=3.133.13 billion...

X= y - 1 y = -4x + 21 answers: a.) (-3,-2) b.) (9,10)

kingalbyss1230

09.01.2022

$x - y = - 1 \\ 4x + y = 21 \\$

Using elimination method

Add equations 1 and 2

$x + 4x \\ - y + y \\ - 1 + 21$

$5x = 20 \\ x = \frac{20}{5} \\ x = 4$

substitute for x in equation 1

$x - y = - 1 \\ 4 - y = - 1 \\ - y = - 1 - 4 \\ \frac{ - y}{ - 1} = \frac{ - 5}{ - 1} \\ y = 5$

Therefore x is 4 and y is 5

(4,5)

If my answer is right, then please give it the brainliest.

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