mom4liak mom4liak

07-07-2022
Mathematics

contestada

Solve the following system by the substitution method. Check the solution(s)
7x + 4y = 10
x+y=1

Respuesta :

chrisbroshera1 chrisbroshera1

07-07-2022

Answer:

x = 2; y = -1

Step-by-step explanation:

We can solve (first for y, then for x) using substitution:

[tex]x+y=1\\7x+4y=10\\(x+y=1)-y\\x=1-y\\\\7(1-y)+4y=10\\7-7y+4y=10\\(7-3y=10)-7\\(-3y=3)/-3\\y=-1\\\\(x-1=1)+1\\x=2[/tex]

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