Question

Can someone plss help me with this? they're linear equations 2x2
0.16x+0.20y=11
x+y=60

Answer 1

Explanation:

0.16x + 0.20y = 11

we can write 0.16 = 16/100 = 4/25 and 0.20 = 20/100 = 1/5

`(4)/(25)x + (1)/(5)y = 11` --------(1)

`x + y = 60 \\` --------(2)

multiply both side by 5 in equation (1) we get

`(4)/(5)x + y =55` --------(3)

Subtract equation 3 from 2

`x - (4)/(5)x + y - y = 60 - 55\\(x)/(5) = 5\\ x = 25`

put the value of x in equation 2

25 + y = 60

y = 35