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Part A. Consider the system of equations

5x+y=31, 

-3x+4y=-37

Solve the first equation for y in terms of x. Enter your answer in "y=..."

 

Part B. Consider the system of equations 

5x+y=31, 

-3x+4y=-37

Take your expression for y from part a and substitute it into the second equation. Solve for x and y. 

Enter your answer as the ordered pair, (x, y)

 Feb 24, 2021
 #1
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+1

5x+y=31,        y = 31 - 5x

 

-3x+4y = - 37

-3 x + 4 ( 31 - 5x) = -  37

-3x + 124 - 20x =  - 37

-23x  =  - 161

x =   161/23 = 7              y = 31 - 5x       =31 - 5 (7) =  -4 

 Feb 24, 2021

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