Mathematics: Given a=-3,b=4 and c=-5 evaluate ab+c

Given a=-3,b=4 and c=-5 evaluate ab+c - id3458442704, kdfawesome5582

cheychey021203

06.02.2022

Step-by-step explanation:

ab+c = 3*4+5 = 12+5 = 17

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anthonymcnulty6471

13.02.2021

The value of the first number is 15

Step-by-step explanation:

The sum of two number is 40 would be:

x+y=40

The second number is 5 less than twice the first number would be:

y=2x-5

Now, we can find the value by solving this system of equations, we will isolate x in the first equation, then we replace it in the second equation:

x=40-y

$y=2(40-y)-5\\y=80-2y-5\\y+2y=75\\3y=75\\y=\frac{75}{3}=25$

Then, we replace this value in one equation of find the other variable:

$x+25=40\\x=40-25\\x=15$

Therefore, the value of the first number is 15 and the second number is 25.

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