exam Maths Puzzle Numerical Ability

Solve by substitution.
2x+5y=23
y=3x+8

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exam Other Question

2 (x+4)= 3x
Just looking for an example close to this.
I got as far as...
2x + 8 = 3x
then do I subtract 2x from each side or 8?
Write the equation of the line, given:
a. m= -1/2, though (2,4)
b. Through (1,5) & (-2,1)