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juniorcehand04
17.07.2019 •
Mathematics
Solve this equation by the substitution method f(x)={2x+3y=25, {x-y=5
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Ответ:
X=5+y; let's plug that in for x in the first equation.
2(5+y)+3y=25
10+2y+3y=25
5y+10=25
Let's subtract 10 from both sides.
5y=15
Now divide both sides by 5.
Y=3
So y is 3. We can plug 3 in for y in the second equation.
X-3=5
X=8
So, X=8 and Y=3.
Ответ:
x - y = 5
x-y = 5 [make x the subject]
x= 5 +y
Now substitute,
2(5+y) + 3y =25
10 + 2y + 3y =25
10 + 5y = 25
5y = 25-10
5y=15
y=15÷5
y=3
Now to find x, substitute the value of y
x = 5 +y
x = 5 +3
x = 8
Ответ:
6.3
Step-by-step explanation:
i had the same question for school