Question

X+Y=4; 2X-5Y=1 substitution method simultaneous equations​

Answer 1

Step-by-step explanation:

$x + y = 4.........(1)eq. \\ 2x - 5y = 1........(2) \\ \\ in \: eq.(1) \\ x + y = 4 \\ x = 4 - y \\ \\ putting \: the \: value \: of \: x \: on \: (2)eq. \\ \\ 2x - 5y = 1 \\ 2( 4 - y) - 5y = 1 \\ 8 - 2y - 5y = 1 \\ 8 - 7y = 1 \\ - 7y = 1 - 8 \\ - 7y = - 7 \\ y = \frac{ - 7}{ - 7} \\ y = 1 \\ \\ putting \: the \: value \: of \: y \: on \: (1)eq. \\ x + y = 4 \\ x + 1 = 4 \\ x = 4 - 1 \\ x = 3 \\ \\ therefore \: the \: value \: x \: = 3 \: and \: y \: = 1$

Answer 2

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