Question

Tinand cont ca x=3, afla a+3b stiind ca: a) xa+3xb=51 b) 2a+6b-x=21 c) 8x-a-3b=7 d) 4a+12b=27-x e) 5ax+15xb-2x=144

Answer 1

A) x(a+3b)=51 3(a+3b)=51 A+3b=17 B) 2(a+3b)-3=21 A+3b=12 C)8*3-(a+3b)=7 24-(a+3b)=7 A+3b=17 D)4(a+3b)=27-3 A+3b=6 E)15(a+3b)-2*3=144 15(a+3b)=150 a+3b=10