Rozwiąż układ równań metodą podstawiania
5b + 3 = 5a + 3b
4b - 2 = 5a + 7
5y + 5 = 2x
x + 3y = 2x
2c - 3d = c - 5
c - 2d = 15
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5b+3=5a+3b \-3
4b-2=5a+7
5b =5a-3+30\-3b
4b-2=5a+7
2b=5a-3\:2
4b-2=5a+7
b=2,5a-1,5
4(2,5a-1,5)-2=5a+7
b=2,5a-1,5
10a-6-2=5a+7\-5a-8
b=2,5a-1,5
5a=15
b=2,5a-1,5
a=3
b=2,5*3 -1,5
a=3
b=6
a=3
5y+5=2x
x+3y=2x \-x
5y+5=2x
x=3y
5y+5=2*3y
x=3y
5y+5=6y\-5y
x=3y
y=5
x=3*5
y=5
x=15
2c-3d=c-5
c-2d=15 \+2d
2c-3d=c-5
c=2d+15
2(2d+15)-3d=2d+15-5
c=2d+15
4d+30-3d=2d+10
c=2d+15
d+30=2d+10 \-d
c=2d+15
d+10=30\-10
c=2d+15
d=20
c=2*20+15
d=20
c=55