Question

Asked Nov 9, 2019

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Solve for x1 and x2

2x1 + 4x2 = 80

3x1 + 1x2 = 60

and then when find x1 multiply by 7

and when find x2 multiply by 9

what is the sum of x1 and x2

Step 1

Consider the equation,

2*x*_{1}+4*x*_{2}=80……… (1)

3*x*_{1}+1*x*_{2}=60……… (2)

Multiplying by 4 in equation (2) and then subtracting it from equation (1),

2*x*_{1}+4*x*_{2}-12*x*_{1}-4*x*_{2} = 80-240

-10*x*_{1 }= -160

*x*_{1 }= -160/-10

*x*_{1} = 16

Substituting the value of *x*_{1} in equation (1),

Step 2

The values of *x*1 and *x*2 are 16 and 12 respectively.

Multiplying *x*1 by 7, th...

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