Find the value of y for a given value of x, if x varies directly with x. If y=39 when x=-117 what is y when x=-132
my answer
y=k*x
39=k*-117
39/-117=k
k=-0.3
y=k*x
y=-0.3*-1.32
y=-3.96 can someone please check my work
except for the decimal point which you inserted (1.32 instead of 132 as shown at the top) it looks ok.
oh ok thanks for catching my mistake
so should be 39.6
or, -39.6
gotta watch the details.
In fact, your lines
y=-0.3*-1.32
y=-3.96
were also off; should have been -0.396
so, even if you had been correct using 1.32, your answer would still have been wrong! :-(
this is what i got
y=39
x=-117
y when x=-132
39/-117=k
k=-0.3
y=-0.3*-132
y=39.6