Question

use Cramer rule to solve each system 1)-2x-2y=19 and 4x+4y=4​

Answer 1

Answer:

Step-by-step explanation:

Solution. If we add the equations as they are, neither one of the unknowns will cancel. Now, if the coefficient of y in equation 2) were −4, then the y's would cancel. Therefore we will expand our strategy as follows:

Make one pair of coefficients negatives of one another -- by multiplying

both sides of an equation by the same number. Upon adding the equations, that unknown will be eliminated.

To make the coefficients of the y's 4 and −4, we will multiply both sides of equation 2) by 4 :

1) 3x + 4y = 19 simultaneous equations 3x + 4y = 19

2) 2x − y = 9 simultaneous equations 8x − 4y = 36

simultaneous equations

11x = 55

x = 55

11

x = 5

Answer 2

Step-by-step explanation:

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