Rozwiąż układy równań:
a) {2x+5)*-30=4x*+18x
5y-4=7x
b) {y+x*-8=x+(2-x)*
3x=1
*- do kwadratu
(4x*+20x+25)-30=4x*+18x
2x=30-25
2x=5
x=2.5
5y-4= 7 x 2,5
5y=17,5
y=3,5
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(4x*+20x+25)-30=4x*+18x
2x=30-25
2x=5
x=2.5
5y-4= 7 x 2,5
5y=17,5
y=3,5