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Use Euler's method with step size `0.5` to compute the approximate `y`-values `y(1.5)` and `y(2)`, of the solution of the initial-value problem
`y^(′) = 2 -5 x + 4 y`,   `y(1)=5`.

`y(1.5)=`   ,

`y(2)=`   .