Question

7m + 5p = 100

8m + 5p = 50
?????

Answer 1

(8) 7m+5p=100
(-7)8m+5p=50

56m+40p=800
-56m-35p=350
5p=450
p=90

8m+5(90)=50
8m+450=50
8m=50-450
8m=400
m=50
 
m+50 e p= 90

Answer 2

Olá, bom dia!


Vamos lá:

$7m + 5p = 100\\8m + 5p = 50 * (-1)\\\\\\ 7m + 5p = 100\\-8m - 5p =-50\\------- (+)\\\\ - m = 50\\\\-m = 50*(-1)\\\\ \boxed{m = -50}\\\\\\\\\\\\7m + 5p = 100\\\\7(-50)+ 5p=100\\\\-350+5p=100\\\\5p=450\\\\p= 450/5\\\\ \boxed{p=90}$

Forte abraço.