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Mama L [17]
3 years ago
10

Monifer used substitution to solve this system of equations. Which equation could be the result of her first step? 3a +b=225 b=a

-15
Mathematics
2 answers:
alexandr402 [8]3 years ago
7 0

Answer:

Step-by-step explanation:

The given system of equations are:

3a+b=225                                         (1)

and b=a-15                                        (2)

Now, substituting the value of b from equation (2) in equation (1), we get

3a+(a-15)=225

⇒3a+a-15=225

⇒4a=225+15

⇒4a=240

⇒a=\frac{240}{4}

⇒a=60

Again, substituting the value of a=60 in equation (2), we get

⇒b=(60)-15

⇒b=45

weeeeeb [17]3 years ago
6 0
3a + a - 15 = 225 . your substituting b(a-15) into the first equation. <span />
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