exam Maths Puzzle Numerical Ability

Solve by the substitution method.

7m + n= 12
m - 8n= 18

Help me please. This chapter is just aweful for me I understand hardly anything.

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exam Other Question

Write the phrase as an algebraic expression. Let x represent the unknown number.
15) The sum of a number and fourteen How many diffrent types of quadrilaterals can two congruent isosceles right triangles form if they share a side?

Thank you so much