exam Maths Puzzle Numerical Ability

Y=3x+5
2y-6x=4
using substitution

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exam Other Question

A triangle with three acute angles and no congruent sides is?

A. an equiangular triangle
B. a right triangle
C. an isosceles triangle
D.an obtuse triangle
E. an acute scalene triangle I am trying to find out the steps of how to get the answer to 2x + x + 1 = 2?