Which statement correctly explains how Andre could find the solution to the following system of linear equations using elimination? 8 s minus 9 t is equal to 15 7 s minus 2 t is equal to 12

Multiply the first equation by −7 to get −56s + 63t = −105, and multiply the second by 8 to get 56s − 16t = 96. Adding the equations cancels the s-terms, leaving 47t = −9. Therefore, the correct choice is D: multiply the first equation by −7 and the second by 8, then add.

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