-6 and -7 because they equal -13
Answer:
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Catalyst is a substance that speeds up the rate of any chemical reaction but they do not take part in the reaction.
<h3>What is a catalyst</h3>
Catalyst is a substance that speeds up the rate of any chemical reaction but they do not take part in the reaction.
Catalysis is the process of increasing the rate of a chemical reaction by the addition of a substance known as a catalyst.
Catalysts are known not to be consumed in the reaction and remain unchanged at the end of a reaction
Learn more on catalyst here: brainly.com/question/12507566
Answer: See below
Step-by-step explanation:
Isolate x for x-2y+2z=9
3x=9+2y
....(1)
Substitute (1) into the 2nd equation


7y=-3
y=-3/7
Substitute y=-3/7


Isolate z by substituting it



For x =9+2y/3 substitute z=59/21 and y=-3/7



The length is 14 yd and the width is 7 yd because 7•2=14 and 14•7= 128 yd²