rosa is 3 years older than her brother marco. let "x" stands for rosa's age and let "y" stands for marco's age . the linear equation of y= x -3 statse marcos age , y , in terms of rosas age , x .
a.when marco is 38, write the equation for rosa's age.
b.when marco is 72, write the equation for rosas age
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so 73 -3 ?? Cx

plug in marco's age for the y, and solve.

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