A) 4*y=-5+3=-2
y=2/4=0.5
b) 14*x+3*x=15-10=5
17*x=5
x=5/17
5x^2 + 4x - 1 = 0
D = b^2 + 4ac = 16 + 20 = 36
x1 = ( - 4 + 6)/10 = 2/10 = 1/5 = 0,2
x2 = ( - 4 - 6)/10 = - 10/10 = - 1
<span>у1= -2+3*2=4, у2=-2+3*5=8
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2х - 5y = 10
y = 0
2x = 10
x = 5
Ответ ( 5 ; 0 )