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konstantin123 [22]
3 years ago
11

If x= 4, what is the value of 8x + 15? OA. 47 B. 52 C. 92 D. 152

Mathematics
2 answers:
Olenka [21]3 years ago
5 0

Answer:47

Step-by-step explanation:

ankoles [38]3 years ago
3 0

Your Answer Will Be: A. 47

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\left\{\begin{array}{ccc}2x+3y=134\\x+5y=179&|\text{subtract 5y from both sides}\end{array}\right\\\\\left\{\begin{array}{ccc}2x+3y=134\\x=179-5y&|\text{substitute to the first equation}\end{array}\right\\\\2(179-5y)+3y=134\qquad\text{use distributive property}\\\\(2)(179)+(2)(-5y)+3y=134\\\\358-10y+3y=134\qquad\text{subtract 358 from both sides}\\\\-7y=-224\qquad\text{divide both sides by (-7)}\\\\\boxed{y=32}\\\\\text{Put the value of y to the second equation}\\\\x=179-5(32)\\\\x=179-160\\\\\boxed{x=19}

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