Exam Maths Puzzle Algebra

for solve for y
1. y-3x=7
2. 2x+y=5

solve for a
a + 3b = -2

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Exam Other Question

I have a triangle... it doesn't look like a right triangle, but the teacher says don't assume anything. The triangle is labelled so: A B C. Intersecting angle B is a line that intersects segment AC.
Here are the measurements of the sides that are given in the problem.
AC = 20
EG = 12
FH = 6
BD = x.
find x.

Thanks
Ben Elam The No. of marbles in box A is two thirds of the No. of marbles in box B Half the marbles in box aA are transferred to box C already containing 5 marbles Now the No. of marbles in box B is twice that in box C. Now the contents of A and the contents of C are transferred to and empty box D. How many marbles would D contain ?