Question

y=5/8x+1.1 определите-значение x,если y(x)=5.6

Answer 1

у=5/8х+1,1

5,6=5/8х+1,1

5/8х=5,6-1,1

5/8х=4,5

х=4,5:5/8=4 1/2:5/8=9/2:5/8=9/2*8/5=72/10=7,2. х=7,2